APA (7th ed.) Citation

ScienceDirect (Online service) & Litwack, G. (2011). Vitamins and the immune system. Elsevier/Academic Press.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service) and Gerald Litwack. Vitamins and the Immune System. London ; Burlington, MA: Elsevier/Academic Press, 2011.

MLA (9th ed.) Citation

ScienceDirect (Online service) and Gerald Litwack. Vitamins and the Immune System. Elsevier/Academic Press, 2011.

Warning: These citations may not always be 100% accurate.