APA Style

Nelson, W, E., Marcdante, K, J. (2011). Nelson essentials of pediatrics : Essentials of pediatrics (6th ed.). Philadelphia: Saunders/Elsevier.

MLA Style

Nelson, Waldo, Emerson., Marcdante, Karen, J. "Nelson essentials of pediatrics : Essentials of pediatrics". 6th ed. Philadelphia: Saunders/Elsevier, 2011. Text.