The International Encyclopedia of the Social Sciences was first published in 1968 and was edited by David L. Sills and Robert K. Merton. It contains seventeen volumes and thousands of entries written by scholars around the world. The 2nd edition is composed entirely of new articles. It was published in 2008 and edited by William A. Darity, Jr., an American economist.
^James P. Cavin, "The International Encyclopedia of the Social Sciences: A Review Article," in American Journal of Agricultural Economics Vol. 51, No. 2 (May, 1969), pp. 268-278. http://www.jstor.org/stable/1237578