K J Madhusoodanan, J Thomas, U. G. K. M. K. P. P. M. “Multivariate Analysis in Large Cardamom (Amomum Subulatum Roxb.)”. Journal of Spices and Aromatic Crops, vol. 15, no. 2, Dec. 2006, pp. 133-5, https://updatepublishing.com/journal/index.php/josac/article/view/4858.