T J Zachariah, Vikram Vikram, S. B. R. K. K. K. S. “Physico-Mechanical Properties of Black Pepper (Piper Nigrum L.)”. Journal of Spices and Aromatic Crops, vol. 22, no. 2, Dec. 2013, pp. 131-7, https://updatepublishing.com/journal/index.php/josac/article/view/5018.