Foning Ramsong, A. “Vegetative Propagii.tion of <I>Cinchona ledgeriana< I> Moens. By Modified Mound and Trench Layerage Methods”. Indian Forester, vol. 93, no. 11, Nov. 1967, pp. 760-2, doi:10.36808/if/1967/v93i11/25727.