WILLIAMS, I.O.; PARKER, R.S.; SWANSON, J. Vitamin A Content of Southeastern Nigerian Vegetable Dishes, Their Consumption Pattern and Contribution to Vitamin A Requirement of Pregnant Women in Calabar Urban, Nigeria. Pakistan Journal of Nutrition, Pakistan, v. 8, n. 7, p. 1000–1004, 2009. DOI: 10.3923/pjn.2009.1000.1004. Disponível em: https://pjnonline.org/pjn/article/view/935. Acesso em: 4 sep. 2025.