BibTex: How to change the reference style

Assumption: 

You use cite.sty to allow the multiple references for \cite. 

\usepackage{cite}
e.g., \cite{Yukawa1900-Nature, Tomonaga1901-Nature}

When you compile the line above, you will see
[1, 2] or [Yukawa 1900, Tomonaga 1900], for instance.

If you want to change them into, e.g., (Yukawa 1900; Tomonaga 1901), 

insert the following three lines in the preamble:

\renewcommand\citeleft{(}

\renewcommand\citeright{)}
\renewcommand\citepunct{;}

Reference

The bottom of cite.sty

http://ftp.yz.yamagata-u.ac.jp/pub/CTAN/macros/latex/contrib/cite/cite.sty