[Tex/LaTex] citation with page number does not work

Question

i want to cite some books as references and add the page number to the reference,
for example i have this bibliography entry :

@book{ref2,
title={Introduction to Information Systems: Supporting and Transforming Business},
author={Rainer, R.K. and Cegielski, C.G.},
isbn={9780470473528},     
year={2010},
publisher={John Wiley \& Sons}
}

i want to refer to the page xi, or page 4, like this :

R.K. Rainer and C.G. Cegielski. Introduction to Information Systems :
Supporting and Transforming Business. John Wiley & Sons, 2010. p. 4.

after some searches i found that this can be done by adding some arguments to cite command, like this:

\cite[options]{ref2}

i tried it with different way that i found while searching:

\cite[chap.~1,p.~4]{ref2}
\cite[p.~4]{ref2}
\cite[extras={,p.~4}]{ref2}
\cite[extras={p.~4}]{ref2}

but it is not showing, it just shows the bib entry (title, author, publisher …), i tried to changed the bibliography style but same (i used plain style, ieeetr and alpha).
for the compilation i think it is working because when changing the style the result changes.

any suggestions?
and thank you^^.

Answer 1

With the plain bibliography style, I was able to use

\cite[pg.100]{ref}

It worked perfectly. It shows up as this in the document:

[5, pg.100]

However, I have no solution for the other bibliography styles.