Roonwal, M. L. “Studies in Intraspecific Variation I. On the Existence of Two Colour-Types in the Adults and Hoppers of the Solitaria Phase in the Desert Locust, Schistocerca Gregaria (ForskÃ¥l). [Orthopetra, Acrididae.]”. Records of the Zoological Survey of India, vol. 44, no. 4, Dec. 1946, pp. 369-74, doi:10.26515/rzsi/v44/i4/1946/162364.