Mica essentially answered your question. To make it slightly more complete: Instead of
\flushright\parbox{5cm}{Daniele Spinosa}
(you don't need the \parbox
here) use
\flushright
Daniele Spinosa
\includegraphics[width=2.5cm]{sig.jpg}
(You might want to adjust the 2.5cm
.)
To a large extent, you can get American punctuation patterns automatically with biblatex
by loading babel
with the [american]
option.
For your bibliography items themselves
If you load the babel
package with the option [american]
, biblatex
will put the punctuation inside the quotation marks automatically. This is explained in section 3.91 of the biblatex
manual.
For in text quotations
The best way to do this automatically is to use the \textquote
command of the csquotes
package. You need to change the default formatting for the citation part of the quote, and you need to redefine the \mktextquote
command. This is explained in section 9.2 of the csquotes
manual.
Here is an example document. Notice that the quotation marks in the text quotation and in the bibliography item are in the correct place for American standards. The example works the same way with the biblatex-chicago
package loaded.
\documentclass[12pt]{article}
\usepackage[citestyle=verbose]{biblatex}
%\usepackage{biblatex-chicago} % or load this instead
\usepackage[american]{babel}
\usepackage{csquotes}
\renewcommand{\mktextquote}[6]{#1#2#4#5#3#6}
\renewcommand*{\mkcitation}{}
\bibliography{biblatex-examples}
\usepackage{lipsum}
\begin{document}
Here is a quotation \textquote[\autocite{shore}]{Some text}.
\end{document}

Best Answer
I took Gonzalo Medina's second solution in his answer to "Inspirational" quote at start of chapter and changed the following:
Instead of using the
memoir
class, theepigraph
package (frommemoir
s author) is loaded;\epigraphfontsize
is replaced with\epigraphsize
;The
etoolbox
package is used to patch the internal\@epitext
command so that\itshape
works.