APA-ийн эшлэл(7 дахь хэвлэлт)

Nebel, B. J., & Wright, R. T. (1993). Environmental science: The way the world works (4th.ed.). Prentice Hall.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Nebel, Bernard J., ба Richard T. Wright. Environmental Science: The Way the World Works. 4th.ed. Englewood Cliffs: Prentice Hall, 1993.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Nebel, Bernard J., ба Richard T. Wright. Environmental Science: The Way the World Works. 4th.ed. Prentice Hall, 1993.