Cita APA (7th ed.)

Leach, N., & Gattuso, J. (1999). Whale watching. Discovery Communications.

Cita Chicago (17th ed.)

Leach, Nicky, i John Gattuso. Whale Watching. Singapore: Discovery Communications, 1999.

Cita MLA (9th ed.)

Leach, Nicky, i John Gattuso. Whale Watching. Discovery Communications, 1999.