Gaya APA

Engger, E, D., Smith, B, F. (2006). Environmental science: a study of interrelationships.-- (Ed.10.--). Boston : MC Graw Hill.

Gaya MLA

Engger, Eldon, D.., Smith, Bradley, F.. "Environmental science: a study of interrelationships.--". Ed.10.-- Boston : MC Graw Hill, 2006. Buku.