Gaya APA

Watkins, J, B., Klaassen, C, S. (2007). Casarett & Doull's Essential of Toxicology . New York: McGraw Hill\'s Access Pharmacy.

Gaya MLA

Watkins, John, B.., Klaassen, Curtis, S.. "Casarett & Doull's Essential of Toxicology". New York: McGraw Hill\'s Access Pharmacy, 2007. Text.