As per the second part of this question, I want to remove the comma from the end of the authors in my in-line citations, e.g.,
Doe et al., 2013 ->
Doe et al. 2013. The solution is to redefine
However, this causes
! LaTeX Error: \nameyeardelim undefined.
natbib with the default options. How can I overcome this error to remove the comma between the last author and year in my in-line citations?