Witthöft Cornelia M, Forssén Karin, Johannesson Lena, and Jägerstad Margaretha. “Folates - Food Sources, Analyses, Retention and Bioavailability”. Food & Nutrition Research (December 1, 1999): 138-146. Accessed December 10, 2022. https://foodandnutritionresearch.net/index.php/fnr/article/view/96.