Zitationen: Michener, C. D. 2012: In Memoriam: Robert R. Sokal (1926-2012). Journal of the Kansas Entomological Society, Lawrence 85 (2), S. 173-175
Schrock, J. R. 2012: Robert R. Sokal, 1926-2012 - Father of Numerical Taxonomy. Entomotropica., Maracay 34 (3), S. 574, B15:11165