I am using the following citation

title={Valuation of basket credit derivatives in the credit migrations     environment},
author={Bielecki, T.R.  and Cr{\'e}pey, S.  and Jeanblanc, M. and Rutkowski, M.},
journal={Handbooks in Operations Research and Management Science},

which I reference inside the document using the command \cite{}. My bibliography style is


Yet, the result I get is the following

enter image description here

Can anyone tell me why is this happening? Thanks in advance.

  • 2
    It would be helpful to have a compilable tex code, not only a code snippet. For example which document class do you use, which packages with which options which change or defines the layout of your bibliography ...
    – Mensch
    Dec 14, 2015 at 16:00
  • Somewhat off-topic, but still relevant: Using the entry type @article is not correct for the entry at hand. You should be using the type @incollection, with editor = "John R. Birge and Vadim Linetsky",, booktitle="Financial Engineering",, chapter=11,, and series = "Handbooks in Operations Research and Management Science",. Also, insert a space between the initials of the first author.
    – Mico
    Dec 14, 2015 at 16:10
  • 1
    Have you loaded the natbib package?
    – Mico
    Dec 14, 2015 at 16:13
  • Thanks for the comment, the documentclass I use is book. In addition, I can change the reference to incollection, once I fix the citation style error. Dec 14, 2015 at 16:13
  • Thank you Mico. It required the natbib package. Once I used it it works fine. Dec 14, 2015 at 16:15

1 Answer 1


You need to load the natbib package when using the bibliography style elsarticle-num-names.

Separately, you shouldn't employ the @article entry type for this entry as it isn't published in a journal. Instead, use the @incollection entry type:

author    = "Tomasz R. Bielecki and St{\'e}phane Cr{\'e}pey and Monique Jeanblanc and Marek Rutkowski",
title     = "Valuation of Basket Credit Derivatives in the Credit Migrations Environment",
chapter   = 11,
editor    = "John R. Birge and Vadim Linetsky",
booktitle = "Financial Engineering",
publisher = "Elsevier",
year      = 2007,
volume    = 15,
pages     = 471--507,
series    = "Handbooks in Operations Research and Management Science",
issn      = "0927-0507",
doi       = "http://dx.doi.org/10.1016/S0927-0507(07)15011-8",
url       = "http://www.sciencedirect.com/science/article/pii/S0927050707150118",

(I obtained this information from the scidirect website.)

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