Verma, V.P.S. and Kharakwal, G.N. 1977. Experimental Tapping of <I>Sterculia villosa</I> Roxb. for Gum Karaya. Indian Forester. 103, 4 (Apr. 1977), 269–272. DOI:https://doi.org/10.36808/if/1977/v103i4/11669.