Cita APA (7th ed.)

ebrary, Inc, & Spies, R. B. (2007). Long-term ecological change in the Northern Gulf of Alaska. Elsevier.

Cita Chicago (17th ed.)

ebrary, Inc, i Robert Bernard Spies. Long-term Ecological Change in the Northern Gulf of Alaska. Amsterdam: Elsevier, 2007.

Cita MLA (9th ed.)

ebrary, Inc, i Robert Bernard Spies. Long-term Ecological Change in the Northern Gulf of Alaska. Elsevier, 2007.