Cita APA (7a ed.)

Raven, P. H., & Johnson, G. B. (1991). Understanding biology. MOSBY-YEAR BOOK.

Cita Chicago Style (17a ed.)

Raven, Peter H., y George B. Johnson. Understanding Biology. Estados Unidos: MOSBY-YEAR BOOK, 1991.

Cita MLA (8a ed.)

Raven, Peter H., y George B. Johnson. Understanding Biology. MOSBY-YEAR BOOK, 1991.