Walton, H.J. and Kemp, S. 1911. Notes on the Occurrence of Apus in Eastern Asia-On the Occurrence of Apus, Latreille, in the United Provinces of India. Records of the Zoological Survey of India. 6, 5 (Nov. 1911), 351–352. DOI:https://doi.org/10.26515/rzsi/v6/i5/1911/163079.