Ham, S. H. (1992). Environmental interpretation: A practical guide for people with big ideas and small budgets. North American Press.
Citace podle Chicago (17th ed.)Ham, Sam H. Environmental Interpretation: A Practical Guide for People with Big Ideas and Small Budgets. Golden, Colo: North American Press, 1992.
Citace podle MLA (9th ed.)Ham, Sam H. Environmental Interpretation: A Practical Guide for People with Big Ideas and Small Budgets. North American Press, 1992.
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