Abdullah, F., and I. Sina. “The Potential of Soursop Seed Extract Annona Muricata Linn As a Biopesticide Against Aphids Aphis Gossypii Glover (Homoptera: Aphididae) on Chilly”. Malaysian Journal of Science, vol. 22, no. 2, Aug. 2003, pp. 11-16, https://juku.um.edu.my/index.php/MJS/article/view/8507.