I had a look to your given files and found several errors there.
I will only list some of the errors here:
- In your
bib file you wrote several times year = {2011a}, or simular. There is only a number allowed, the year. The a should you better write in the key, for example @article{Felbermayr.2011a,
- And so I changed in your tex code the
\cite commands to use the corresponding cite keys.
- You mixed environments for
pdflatex (inputenc) and xelatex (\setmainfont). I commented the first one.
- Because in your german
bst file version are so much errors I changed the style to the english style. My answer here is late so I do not correct the german bst file if there is no need for that work. One remark: not all "and" can be changed to "und". Only the one enclosed with " " ... Most of the errors you got are caused in the faulty german version of the bst file ...
- I made your code shorter (deleted unused code for the preblem here) and used package
filecontents to add the corrrected bib file into the mwe.
- I fixed some warnings because the
bst file uses old commands \bf etc.
- I moved package
hyperref to be the last called package. You should rework the order of package calls ...
The following MWE compiles without error and only one warning (comming from filecontents, that's okay!):
\RequirePackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@misc{Felbermayr.2013b,
author = {Felbermayr, Gabriel J. and Larch, Mario and Flach, Lisandra and
Yalcin, Erdal and Benz, Sebastian},
year = {2013},
title = {Dimensionen und Auswirkungen eines Freihandelsabkommens zwischen der EU und den USA},
url = {http://www.cesifo-group.de/DocDL/ifo\_AH\_2013\_TAFTA\_Endbericht.pdf},
address = {M{\"u}nchen},
urldate = {29/08/2014},
series = {Studie im Auftrag des Bundesministeriums f{\"u}r Wirtschaft
und Technologie --Endbericht},
institution = {{ifo Institut}},
}
@article{Felbermayr.2013a,
author = {Felbermayr, Gabriel J. and Larch, Mario and Lechthaler, Wolfgang},
year = {2013},
title = {Unemployment in an Interdependent World},
pages = {262--301},
volume = {5},
number = {1},
issn = {1945-7731},
journal = {American Economic Journal: Economic Policy},
doi = {10.1257/pol.5.1.262},
}
@article{Felbermayr.2011a,
author = {Felbermayr, Gabriel J. and Prat, Julien and
Schmerer, Hans-J{\"o}rg},
year = {2011},
title = {Globalization and Labor Market Outcomes: Wage Bargaining,
Search Frictions, and Firm Heterogeneity},
pages = {39--73},
volume = {146},
number = {1},
issn = {00220531},
journal = {Journal of Economic Theory},
doi = {10.1016/j.jet.2010.07.004},
}
@article{Felbermayr.2011b,
author = {Felbermayr, Gabriel J. and Prat, Julien and Schmerer, Hans-J{\"o}rg},
year = {2011},
title = {Trade and Unemployment: What Do the Data Say?},
pages = {741--758},
volume = {55},
number = {6},
issn = {00142921},
journal = {European Economic Review},
doi = {10.1016/j.euroecorev.2011.02.003},
}
@article{HELPMAN.2010a,
author = {Helpman, Elhanan and Itskhoki, Oleg},
year = {2010},
title = {Labour Market Rigidities, Trade and Unemployment},
pages = {1100--1137},
volume = {77},
number = {3},
issn = {00346527},
journal = {Review of Economic Studies},
doi = {10.1111/j.1467-937X.2010.00600.x},
}
@article{Helpman.2010c,
author = {Helpman, Elhanan and Itskhoki, Oleg and Redding, Stephen J.},
year = {2010},
title = {Inequality and Unemployment in a Global Economy},
pages = {1239--1283},
volume = {78},
number = {4},
issn = {0012-9682},
journal = {Econometrica},
doi = {10.3982/ECTA8640},
}
\end{filecontents*}
\documentclass[%
fontsize=12pt, % Schriftgr??e (12pt, 11pt (Standard))
titlepage, % Titelei auf eigener Seite
headings=small, % Überschriften etwas kleiner (smallheadings)
]{scrartcl}
%% Deutsche Anpassungen %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%\usepackage[T1]{fontenc}
%\usepackage[ansinew]{inputenc}
\usepackage[ngerman]{babel}
\usepackage{geometry}
\geometry{a4paper, top=25mm, left=40mm, right=20mm, bottom=20mm}
\usepackage{mathptmx}
\usepackage{mathspec}
\setromanfont{Times New Roman}
\addtokomafont{disposition}{\rmfamily}
\usepackage{color}
%\usepackage{titlesec} % Warning with KOMA-Script
%% Bibliographiestil %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{natbib}
\bibliographystyle{aer}% aer_german3 aer
\renewcommand*{\bibfont}{\footnotesize}
\setlength{\bibsep}{0.0pt}
\setlength{\footskip}{1cm}
\setmainfont[Mapping=tex-text]{Times New Roman}
\usepackage{unicode-math} \setmathfont{XITS Math}
\usepackage{hyperref}
\begin{document}
TEXT
\citep{Felbermayr.2011a}
\citep{Felbermayr.2013a}
\citep{HELPMAN.2010a}
\citep{Helpman.2010c}
{
\let\it\itshape
\let\bf\bfseries
\bibliography{\jobname}
}
\end{document}
Best Answer
This style already uses the sorting function. You can edit sort function bib.sort.order in your .bst file. It is very good described on Bibtex .bst file modification to include alphabetical ordering. I hope it will help you.