Loundsbury, J. F. (1986). Introduction to geographic field methods and techniques GA151 (3rd ed.). Merrill Publishing.
Citace podle Chicago (17th ed.)Loundsbury, John F. Introduction to Geographic Field Methods and Techniques GA151. 3rd ed. Columbia, Ohio: Merrill Publishing, 1986.
Citace podle MLA (9th ed.)Loundsbury, John F. Introduction to Geographic Field Methods and Techniques GA151. 3rd ed. Merrill Publishing, 1986.
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