Cita APA (7th ed.)

JOHNSON, G. B., & OBER, W. C. (2010). Essentials of the living world. Mc Graw-Hill.

Cita Chicago (17th ed.)

JOHNSON, George B., i William C. OBER. Essentials of the Living World. Mc Graw-Hill, 2010.

Cita MLA (9th ed.)

JOHNSON, George B., i William C. OBER. Essentials of the Living World. Mc Graw-Hill, 2010.