"Heme and non-heme in Iron". The Nutrition Source, TH Chan School of Public Health, Harvard University. 2020. Archived from the original on 2020-10-27. Retrieved 2020-10-24.
"Heme and non-heme in Iron". The Nutrition Source, TH Chan School of Public Health, Harvard University. 2020. Archived from the original on 2020-10-27. Retrieved 2020-10-24.