LaTeX Forum

\usepackage[style=authoryear,backend=bibtex,maxcitenames=2,maxbibnames=100]{biblatex}
\renewcommand*{\nameyeardelim}{\addcomma\space}
\DefineBibliographyStrings{english}{
    andothers = {et\addabbrvspace al\adddot}}
\DeclareNameAlias{sortname}{last-first}
\bibliography{ref}

% The counter 'abbrvpenalty' holds the penalty used in short or
% abbreviated bibliography strings. For example, a linebreak in
% expressions such as "et al." or "ed. by" is unfortunate, but should
% still be possible to prevent overfull boxes. We use TeX's
% \hyphenpenalty (normally 50) as the default value. The idea is
% making TeX treat the whole expression as if it were a single,
% hyphenatable word as far as line-breaking is concerned. If you
% dislike such linebreaks, use a higher value. If you do not mind
% them at all, set this counter to zero. If you want to suppress them
% unconditionally, set it to 10000.
\defcounter{abbrvpenalty}{\hyphenpenalty}