Roongsiri Kamtrakul. 1988. Effects of dietary fat and B-carotene from green leafy vegetable supplementation on vitamin A nutrition in preschool children. Bangkok:Mahidol University;
Roongsiri Kamtrakul. (1988) Effects of dietary fat and B-carotene from green leafy vegetable supplementation on vitamin A nutrition in preschool children (รายงานผลงานวิจัย). Mahidol University:Bangkok.
Roongsiri Kamtrakul. Effects of dietary fat and B-carotene from green leafy vegetable supplementation on vitamin A nutrition in preschool children. Bangkok:Mahidol University, 1988.
Roongsiri Kamtrakul. (1988) Effects of dietary fat and B-carotene from green leafy vegetable supplementation on vitamin A nutrition in preschool children (รายงานผลงานวิจัย). Mahidol University:Bangkok.