APA
Roy O. Greep, . (1960). Endocrinology. New York: J.B. lippincott Company.
Chicago
Roy O. Greep, . 1960. Endocrinology. New York: J.B. lippincott Company.
Harvard
Roy O. Greep, . (1960). Endocrinology. New York: J.B. lippincott Company.
MLA
Roy O. Greep, . Endocrinology. New York: J.B. lippincott Company. 1960.