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 (Dec. 1971), 241–247. DOI:https://doi.org/10.26515/rzsi/v69/i1-4/1971/161411.