Alizai, M. . N. K. “Studies on the Preparation and Composition of Guava (Psidiuni Guajava L.) Toffee and Slab Bars”. Biological Sciences - PJSIR, vol. 50, no. 4, Aug. 2007, pp. 288-92, http://v2.pjsir.org/index.php/biological-sciences/article/view/1009.