APA-ийн эшлэл(7 дахь хэвлэлт)

Spencer, E. W. (2003). Earth science: Understanding environmental systems. McGraw - Hill.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Spencer, Edgar W. Earth Science: Understanding Environmental Systems. Boston: McGraw - Hill, 2003.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Spencer, Edgar W. Earth Science: Understanding Environmental Systems. McGraw - Hill, 2003.