My bibliography settings are Natbib author-year, and this is what I want. The command I actually tried in the preamble is this oneStrange. It works on my end with Koma and elsart-harv. I did assume that you have Document->Settings->Bibliography set to Natbib->Numerical, which is why you received an error saying Natbib has already been called.Could you send a small example file demonstrating the problem? Cheers, /Bob
\usepackage[authoryear,sort]{natbib} Thanks, Guillaume