JOHNSON K GEORGE, A. S. T. J. Z. B. S. “Biochemical Variability in Selected Ginger (Zingiber Officinale Rosc.) Germplasm Accessions”. Journal of Spices and Aromatic Crops, vol. 6, no. 2, Dec. 1997, pp. 119-27, https://updatepublishing.com/journal/index.php/josac/article/view/4402.