Cita APA (7a ed.)

World Book, Inc. (1981). Medical update: The World Book family health annual. World Book-Childcraft International.

Cita Chicago Style (17a ed.)

World Book, Inc. Medical Update: The World Book Family Health Annual. Chicago: World Book-Childcraft International, 1981.

Cita MLA (8a ed.)

World Book, Inc. Medical Update: The World Book Family Health Annual. World Book-Childcraft International, 1981.