Cita APA (7th ed.)

Ritchie , D. D., & Carola, R. (1983). Biology: Donald D. Ritchie, Robert Carola (2nd ed.). Addison- Wesley.

Cita Chicago (17th ed.)

Ritchie , Donald D., i Robert Carola. Biology: Donald D. Ritchie, Robert Carola. 2nd ed. Reading Mass: Addison- Wesley, 1983.

Cita MLA (9th ed.)

Ritchie , Donald D., i Robert Carola. Biology: Donald D. Ritchie, Robert Carola. 2nd ed. Addison- Wesley, 1983.