K V Saji, P R Rahul, T E Sheeja, G Uma, B Sasikumar,. 2013. “Genetic Diversity Study in Piper Spp. Using Inter Simple Sequence Repeat (ISSR) Markers”. Journal of Spices and Aromatic Crops 22 (2):111-19. https://updatepublishing.com/journal/index.php/josac/article/view/5012.