Mahmood, Shahid, Masood Sadiq Butt, Faqir Muhammad Anjum, and Haq Nawaz. 2008. “Baking and Storage Stability of Retinyl Acetate (Vitamin A) Fortified Cookies”. Pakistan Journal of Nutrition 7 (4): 586–589. https://doi.org/10.3923/pjn.2008.586.589.