Nelson, D. (1997). Student Study Guide to Accompany Environmental Science: A Global Concern (4th ed.). WCB/McGraw-Hill.
Citace podle Chicago (17th ed.)Nelson, Darby. Student Study Guide to Accompany Environmental Science: A Global Concern. 4th ed. Boston: WCB/McGraw-Hill, 1997.
Citace podle MLA (9th ed.)Nelson, Darby. Student Study Guide to Accompany Environmental Science: A Global Concern. 4th ed. WCB/McGraw-Hill, 1997.
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