Gerber, R. V. (1979). Development of competence and performance in cartographic language by children at the concrete level of map-reasoning.
Citace podle Chicago (17th ed.)Gerber, Rodney Victor. Development of Competence and Performance in Cartographic Language by Children at the Concrete Level of Map-reasoning. 1979.
Citace podle MLA (8th ed.)Gerber, Rodney Victor. Development of Competence and Performance in Cartographic Language by Children at the Concrete Level of Map-reasoning. 1979.
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