APA-čujuhus (7. p.)
Gray, C. B. (2007). Philosophy of man at recreation and leisure. P. Lang.
Chicago-čujuhus (17. p.)
Gray, Christopher B. Philosophy of Man at Recreation and Leisure. New York: P. Lang, 2007.
MLA-čujuhus (9. p.)
Gray, Christopher B. Philosophy of Man at Recreation and Leisure. P. Lang, 2007.
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