Παραπομπή APA

(1969). A program for outdoor recreation research: Report on a study conference conducted, June 2-8, 1968. Washington: National Academy of Sciences.

Παραπομπή Chicago Style

A Program for Outdoor Recreation Research: Report On a Study Conference Conducted, June 2-8, 1968. Washington: National Academy of Sciences, 1969.

Παραπομπή MLA

A Program for Outdoor Recreation Research: Report On a Study Conference Conducted, June 2-8, 1968. Washington: National Academy of Sciences, 1969.

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