# Biblatex — how to add comma before and between two names

I'm currently getting:

Surname, IN and Secondauthorsurname, FM.

I need:

Surname, IN, and Secondauthorsurname, FM.

Searching for "comma" in the documentation is impossible, since it also hits on "command"

\documentclass{memoir}

\usepackage[american]{babel}

\usepackage{biblatex}
\DeclareLanguageMapping{american}{american}

\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}
@Article{Reference:1994,
author =   {First I. Last, and Second Y. Author},
title =    {This is the article title},
journal =  {T Journal T},
journallongtitle =     {The Journal Title},
year =     1994,
volume =   50,
pages =    {30--40}
}
}
\end{filecontents}

\nocite{*}

\begin{document}

\printbibliography

\end{document}

• Again it would be very helpful to know what style you use. Also, the language option is important. You might want to add a short MWE. – moewe Nov 1 '13 at 17:16
• Thanks. Do you use babel/polyglossia? If so, what language do you load? – moewe Nov 1 '13 at 17:20
• I added the two lines from my file which address language --- not sure why they're needed since having or not having them doesn't influence the output. – WillAdams Nov 1 '13 at 17:56
• If you are using american you will not notice any difference, since biblatex defaults to english=american. But try the MWE below with british instead of american and you will see a difference. – moewe Nov 1 '13 at 18:25
• Also note that you should not add the comma between the names, the and suffices. So do not write {First I. Last, and Second Y. Author} but {First I. Last and Second Y. Author}. journallongtitle does not seem to be a standard field. – moewe Nov 1 '13 at 18:26

Try the following redefinitions in your preamble.

\renewcommand*{\finalnamedelim}{%
\finalandcomma

\renewcommand*{\finallistdelim}{%
\finalandcomma


The MWE

\documentclass{memoir}
\usepackage[american]{babel}
\usepackage{biblatex}

\begin{filecontents}{\jobname.bib}
@Article{Reference:1994,
author =   {First Last and Second Author},
title =    {This is the article title},
journal =  {T Journal T},
year =     1994,
volume =   50,
pages =    {30--40}
}
}
\end{filecontents}

\renewcommand*{\finalnamedelim}{%
\finalandcomma

\renewcommand*{\finallistdelim}{%
\finalandcomma