NARAYANAN, N GOPALAKRISRNAN, C S. “Detection of Organochlorine Pesticide Residues in Black Pepper and Clove Using Tolidine Paper”. Journal of Spices and Aromatic Crops 7, no. 1 (June 23, 1998): 23–26. Accessed October 5, 2025. https://www.updatepublishing.com/journal/index.php/josac/article/view/4407.