RAJENDRA HEGDE, M M HOSMANI, V. S. K. R. M. “Coffee - Cardamom, Black Pepper and Mandarin Mixed Cropping System - a Case Study”. Journal of Spices and Aromatic Crops, vol. 6, no. 1, June 1997, pp. 01-07, https://updatepublishing.com/journal/index.php/josac/article/view/4387.