Cita APA

Murphy, J., & Murphy, J. (1991). Keys to nutrition over fifty. United States of America: Barron's.

Citación estilo Chicago

Murphy, Jo, y Jo Murphy. Keys to Nutrition Over Fifty. United States of America: Barron's, 1991.

Cita MLA

Murphy, Jo, y Jo Murphy. Keys to Nutrition Over Fifty. United States of America: Barron's, 1991.