Walton, H. J., & 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), 351–352. https://doi.org/10.26515/rzsi/v6/i5/1911/163079