Cita APA (7th ed.)

Harris, T. Y., & Heins, S. (1980). Trees. Nelson.

Cita Chicago (17th ed.)

Harris, Thistle Y., i Susan Heins. Trees. West Melbourne, Vic.: Nelson, 1980.

Cita MLA (8th ed.)

Harris, Thistle Y., i Susan Heins. Trees. Nelson, 1980.