Cita APA (7th ed.)

Van Tol, A. (2010). Orca echoes resource guide. Orca Book Publishers.

Cita Chicago (17th ed.)

Van Tol, Alex. Orca Echoes Resource Guide. [Victoria, British Columbia]: Orca Book Publishers, 2010.

Cita MLA (9th ed.)

Van Tol, Alex. Orca Echoes Resource Guide. Orca Book Publishers, 2010.