Elizabeth Koshy, Bibi, Oyyan Selvaraj, and Muniandy Sekaran. 2008. “Variation in Meristic Characters of Four Strains of Malaysian Freshwater Angelfish Pterophyllum Scalare (L.)”. Malaysian Journal of Science 27 (1):69-73. https://adum.um.edu.my/index.php/MJS/article/view/7934.