Παραπομπή APA

Jensen, C. R. (1977). Outdoor recreation in America: Trends problems and opportunities (3rd ed.). Minneapolis: Burgess.

Παραπομπή Chicago Style

Jensen, Clayne R. Outdoor Recreation in America: Trends Problems and Opportunities. 3rd ed. Minneapolis: Burgess, 1977.

Παραπομπή MLA

Jensen, Clayne R. Outdoor Recreation in America: Trends Problems and Opportunities. 3rd ed. Minneapolis: Burgess, 1977.

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