Citace podle APA (7th ed.)

(1994). Project learning tree: Environmental education activity guide (2nd.). Project Learning Tree.

Citace podle Chicago (17th ed.)

Project Learning Tree: Environmental Education Activity Guide. 2nd. Washington: Project Learning Tree, 1994.

Citace podle MLA (9th ed.)

Project Learning Tree: Environmental Education Activity Guide. 2nd. Project Learning Tree, 1994.

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