Roonwal, M. L. and Verma, S. C. (1971) “Imago of the Wood-Termite <i>Heterotermes gertrudae</i> Roonwal (Rhinotermitidae : Heterotermitinae) from North-West Himalayas”, Records of the Zoological Survey of India, 69(1-4), pp. 241–247. doi: 10.26515/rzsi/v69/i1-4/1971/161411.