National Council for Geographic Education (U.S.) & Gabler, R. E. (1966). A Handbook for geography teachers. National Council for Geographic Education.
Citace podle Chicago (17th ed.)National Council for Geographic Education (U.S.) a Robert E. Gabler. A Handbook for Geography Teachers. Chicago. Ill.: National Council for Geographic Education, 1966.
Citace podle MLA (8th ed.)National Council for Geographic Education (U.S.) a Robert E. Gabler. A Handbook for Geography Teachers. National Council for Geographic Education, 1966.
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