Karasakal, Ayca, and Yelda Yalcin Gurkan. “Determination of Ascorbic Acid in Common Fruits, Herbal Tea by Using Cuprac and Cerac Methods”. Asian Journal of Chemistry, vol. 24, no. 6, Feb. 2012, pp. 2609-12, https://asianpubs.org/index.php/ajchem/article/view/9181.