Citazione Stile APA (7a Edizione)

Kircher, H. B., Wallace, D. L., & Gore, D. J. (1988). Our natural resources and their conservation (6th ed.). Interstate Printers & Publishers.

Citazione stile Chigago Style (17a edizione)

Kircher, Harry B., Donald L. Wallace, e Dorothy J. Gore. Our Natural Resources and Their Conservation. 6th ed. Danville, Ill.: Interstate Printers & Publishers, 1988.

Citatione MLA (9a ed.)

Kircher, Harry B., et al. Our Natural Resources and Their Conservation. 6th ed. Interstate Printers & Publishers, 1988.