Cita APA (7th ed.)

Stephens, G. C., & Best North, B. (1974). Biology. John Wiley and Sons.

Cita Chicago (17th ed.)

Stephens, Grover C., i Barbara Best North. Biology. NewYork: John Wiley and Sons, 1974.

Cita MLA (9th ed.)

Stephens, Grover C., i Barbara Best North. Biology. John Wiley and Sons, 1974.