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Encyclopædia of Vitamins, Minerals, and Supplements. Infobase Publishing. ISBN 9781438121031. Iron supplements cause a grayish-black stool that should be distinguished...

Vitamins, Minerals, and Supplements. Infobase Publishing. p. 155. ISBN 978-1-4381-2103-1. Lundblad RL, Macdonald F (30 July 2010). Handbook of Biochemistry...

of Vitamins, Minerals, and Supplements. Infobase Publishing. ISBN 978-1-4381-2103-1. Ohm, Christian; Curic, Anton (1999). Gesundheitslexikon von A – Z...