APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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