Cita APA

Blokpoel, H., & Tessier, G. (1988). The Ring-billed gull in Ontario: A review of a new problem species. Ontario, Canadá: CWS.

Citación estilo Chicago

Blokpoel, H., y G.D. Tessier. The Ring-billed Gull in Ontario: A Review of a New Problem Species. Ontario, Canadá: CWS, 1988.

Cita MLA

Blokpoel, H., y G.D. Tessier. The Ring-billed Gull in Ontario: A Review of a New Problem Species. Ontario, Canadá: CWS, 1988.