“The effect of 2,4 dichlorophenoxyacetic acid on in vitro callogenesis of cocoa (Theobroma cacao L.)” (2015) Pelita Perkebunan (a Coffee and Cocoa Research Journal), 31(2), pp. 90–98. Available at: https://ccrjournal.com/index.php/ccrj/article/view/ (Accessed: 10 May 2026).