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), pp. 351–352. doi: 10.26515/rzsi/v6/i5/1911/163079.