Dyfyniad APA

Enger, E. D., & Smith, B. F. (2000). Environmental science: A study of interrelationships (7th ed.). Boston, Mass: McGraw-Hill.

Dyfyniad Arddull Chicago

Enger, Eldon D., và Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 7th ed. Boston, Mass: McGraw-Hill, 2000.

Dyfyniad MLA

Enger, Eldon D., và Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 7th ed. Boston, Mass: McGraw-Hill, 2000.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.