Cita APA (7th ed.)

Barr, B. B., & Leyden, M. B. (1980). Life science. Addison-Wesley.

Cita Chicago (17th ed.)

Barr, Bonnie B., i Michael B. Leyden. Life Science. Menlo Park, CA: Addison-Wesley, 1980.

Cita MLA (9th ed.)

Barr, Bonnie B., i Michael B. Leyden. Life Science. Addison-Wesley, 1980.