Cita APA (7a ed.)

African Seabird Group & Pacific Seabird Group. (1990). Marine ornithology. African Seabird Group.

Cita Chicago Style (17a ed.)

African Seabird Group y Pacific Seabird Group. Marine Ornithology. Rondebosch, South Africa: African Seabird Group, 1990.

Cita MLA (9a ed.)

African Seabird Group y Pacific Seabird Group. Marine Ornithology. African Seabird Group, 1990.