(Extracted from <https://correlatesofwar.org/data-sets/igos/>)

Citation
--------

In any papers or publications that utilize this data set, users are asked to
give the version number and cite the documentation for the data set, as follows
(this citation will be replaced by the article of record for the data set when
information is available):

  Pevehouse, Jon C.W., Timothy Nordstron, Roseanne W McManus, Anne Spencer
  Jamison, "Tracking Organizations in the World: The Correlates of War IGO
  Version 3.0 datasets", Journal of Peace Research.

The original IGO data set was collected by Michael Wallace and J. David Singer
and is described in:

  Wallace, Michael, and J. David Singer. 1970. "International Governmental
  Organization in the Global System, 1815-1964." International Organization
  24: 239-87.