Khamis , Haji M., et al. “ Quantification of All Trans-Lycopene, Cis-Lycopene and Β-Carotene from Watermelons Found in Zanzibar ”. African Journal of Education,Science and Technology (AJEST), vol. 4, no. 4, Dec. 2018, pp. Pg 1-9, https://ajest.org/index.php/ajest/article/view/133.