Cita APA (7th ed.)
Raven, P. H., & Johnson, G. B. (1988). Understanding biology. Times Mirror/Mosby.
Cita Chicago (17th ed.)
Raven, Peter H., i George B. Johnson. Understanding Biology. St. Louis: Times Mirror/Mosby, 1988.
Cita MLA (9th ed.)
Raven, Peter H., i George B. Johnson. Understanding Biology. Times Mirror/Mosby, 1988.
Atenció: Aquestes cites poden no estar 100% correctes.