1. Phylogeny of the Leucas Group (Lamiaceae)
2. Willis, J.C. (1973). A Dictionary of Flowering Plants and Ferns. Cambridge University Press, Cambridge.
3. Stracheyi, R. (1974). The catalogue of the plants of Kumaun and of the adjacent portion of Garhwal and Tibet, Periodical Experts, New Delhi, Reprint Edition, pp.144.