Lo, B. (2010). GPS and geocaching in education (First edition.). International Society for Technology in Education.
Citace podle Chicago (17th ed.)Lo, Burt. GPS and Geocaching in Education. First edition. Eugene, Oregon: International Society for Technology in Education, 2010.
Citace podle MLA (9th ed.)Lo, Burt. GPS and Geocaching in Education. First edition. International Society for Technology in Education, 2010.
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