Tayyab, Muhammad, Arif Rashid Malik, and Abdus Salam Khan. “Du PHENOTYPE - A REVIEW”. Journal of Ayub Medical College Abbottabad 12, no. 3 (September 29, 2000). Accessed May 4, 2025. https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/5182.