UMESHA, Y. G. S. H. M. C. K. “Flowering and Fruit Set in Vanilla (Vanilla Planifolia Andr.)”. Journal of Spices and Aromatic Crops, vol. 5, no. 2, Dec. 1996, p. 148, https://updatepublishing.com/journal/index.php/josac/article/view/4386.