Gray, H. R. (1978). Enjoyment dimensions of favorite leisure activities of middle- and old-aged adults based on the flow model of enjoyment. Univ. Microfilms Internat.
Chicago-Zitierstil (17. Ausg.)Gray, Howard Richard. Enjoyment Dimensions of Favorite Leisure Activities of Middle- and Old-aged Adults Based on the Flow Model of Enjoyment. [Ann Arbor, Mi.]: Univ. Microfilms Internat, 1978.
MLA-Zitierstil (9. Ausg.)Gray, Howard Richard. Enjoyment Dimensions of Favorite Leisure Activities of Middle- and Old-aged Adults Based on the Flow Model of Enjoyment. Univ. Microfilms Internat, 1978.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.