Cita APA (7th ed.)

Pettit, T. S. (1966). A guide to nature projects. W.W.Norton.

Cita Chicago (17th ed.)

Pettit, Ted S. A Guide to Nature Projects. New York: W.W.Norton, 1966.

Cita MLA (9th ed.)

Pettit, Ted S. A Guide to Nature Projects. W.W.Norton, 1966.