Não informado. (1984). World leisure & recreation. World Leisure and Recreation Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. World Leisure & Recreation. New York: World Leisure and Recreation Association, 1984.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. World Leisure & Recreation. World Leisure and Recreation Association, 1984.
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