Cita APA (7a ed.)

Harrap, S., & Qinn, D. (1996). Tits, nuthatches & treecreepers. Helm.

Cita Chicago Style (17a ed.)

Harrap, Simon, y David Qinn. Tits, Nuthatches & Treecreepers. London: Helm, 1996.

Cita MLA (9a ed.)

Harrap, Simon, y David Qinn. Tits, Nuthatches & Treecreepers. Helm, 1996.