Kircher, H. B., Wallace, D. L., & Gore, D. J. (1988). Our natural resources and their conservation (6th ed.). Interstate Printers & Publishers.
Lua i Stíl Chicago (17ú heag.)Kircher, Harry B., Donald L. Wallace, agus Dorothy J. Gore. Our Natural Resources and Their Conservation. 6th ed. Danville, Ill.: Interstate Printers & Publishers, 1988.
Lua MLA (9ú heag.)Kircher, Harry B., et al. Our Natural Resources and Their Conservation. 6th ed. Interstate Printers & Publishers, 1988.
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