B. Rajendra Madhav, J. V. Ramana Rao, and K. V. Lakshminarayana, “Sex-Ratio of the Chewing-Lice, <I>Piagetiella</I> sp. (Phthiraptera : Insecta) of Grey Pelican”, rzsi, vol. 86, no. 3-4, pp. 461–466, Dec. 1990.