APA-ийн эшлэл(7 дахь хэвлэлт)

Enger, E. D., & Smith, B. F. (1992). Environmental science: A study of interrelationships (4th ed.). W.C. Brown.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Enger, Eldon D., ба Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 4th ed. Dubuque, IA: W.C. Brown, 1992.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Enger, Eldon D., ба Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 4th ed. W.C. Brown, 1992.