I'm using classicthesis 4.1 in LyX to write my thesis and I need help with natbib's citation style.

I can't seem to change the natbib numerical citation style to (Author et al., XXXX; Author2 et al., YYYY).

I have this current line, however, I cant find the right place to put it to make it work:


Present situation:


Desired result:


PS. I am aware that the classicthesis manual states:

Citation format is governed by the natbib numerical style invoked in the document settings of the main thesis file (beware, options chosen in classicthesis-config.tex will have no effect).


This seems to do what you want:

   author = {{Sievers}, J.~L. and {Achermann}, C. and {Bond}, J.~R. and {Bronfman}, L. and
    {Bustos}, R. and {Contaldi}, C.~R. and {Dickinson}, C. and {Ferreira}, P.~G. and
    {Jones}, M.~E. and {Lewis}, A.~M. and {Mason}, B.~S. and {May}, J. and
    {Myers}, S.~T. and {Oyarce}, N. and {Padin}, S. and {Pearson}, T.~J. and
    {Pospieszalski}, M. and {Readhead}, A.~C.~S. and {Reeves}, R. and
    {Taylor}, A.~C. and {Torres}, S.},
    title = "{Implications of the Cosmic Background Imager Polarization Data}",
     journal   = "Astrophys. J.",
     year = "2007",
    pages = {976-987},

    author = "Michel Goossens",
    title = "The {LaTeX} Companion",
    year = "1993",
    publisher = "Addison-Wesley",
    address = "Reading, Massachusetts"

\hypersetup{colorlinks=true,citecolor=cyan}% just for the example




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  • Again, thank you for your answer. I still can't make it work. Where should I put your solution, and which part of it? What I already have in classicthesis-config.tex: \PassOptionsToPackage{square,numbers}{natbib} \usepackage{natbib} – SplitteMineBramsejl Aug 30 '13 at 18:59
  • @user212704 You're welcome. Try removing those lines from classicthesis-config.tex and use \usepackage[authoryear,round,colon]{natbib} in the preamble of your actual document. The filecontents* environment in my example code is not essential (you don't need it in your document); it was just to make my example self-contained. – Gonzalo Medina Aug 30 '13 at 20:14
  • After doing that, it seems that my natbib update clashes with a style already loaded. The returning error message: "LaTeX Error: Option clash for package natbib. The package natbib has already been loaded with options: [numbers] There has now been an attempt to load it with options [authoryear,round,colon] Adding the global options: numbers,authoryear,round,colon to your \documentclass declaration may fix this." However, I can't find where the natbib is loaded. – SplitteMineBramsejl Aug 30 '13 at 20:27
  • @user212704 Then remove that line from your document and load the class with the global options: \documentclass[authoryear,round,colon]{scrbook}. – Gonzalo Medina Aug 30 '13 at 20:29
  • @user212704 in the default classicthesis-config.tex natbib is loaded in line 83: \PassOptionsToPackage{square,numbers}{natbib} \usepackage{natbib}. If you have the default file, you could also do the change there. – Gonzalo Medina Aug 30 '13 at 20:32

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