I need the in-text citation style to be author-year, i.e: "Author1, 1999". I have implemented
\renewcommand{\citep}[1]{(\citeauthor{#1},~\citeyear{#1})}
(from this post) which returns what I want if there's only one author. But if there's multiple authors it returns:
(Author1, Author2, 1999, 1998)
What I need is:
(Author1, 1999, Author2, 1998)
How can I do this?
Instead of changing the citation command, you should set the citation style. As far as I can deduce from the example, in your case this would be:
\setcitestyle{authoryear,comma,aysep{,}}
The first option indicates you will use author year, the second option that the separation between citations needs to be a comma, and the final option that the separation between author and year needs to be a comma.
If you are using biblatex as the tagging suggests, use an authoryear style, set nameyeardelim and \multicitedelim and cite with \autocite.
\documentclass[british]{article}
\usepackage[T1]{fontenc}
\usepackage{babel}
\usepackage{csquotes}
\usepackage[backend=biber, style=authoryear]{biblatex}
\renewcommand*{\multicitedelim}{\addcomma\space}
\DeclareDelimFormat[parencite]{nameyeardelim}{\addcomma\space}
\addbibresource{biblatex-examples.bib}
\begin{document}
Lorem \autocite{sigfridsson,worman}
dolor \autocite{nussbaum}
\printbibliography
\end{document}
It is almost always a bad idea to combine several \...cite commands into a single \newcommand, because commands thus defined cannot deal with multiple citations, need additional help to handle pre- and postnotes and can confuse the various citation tracking features.
