APA استشهاد

Graefe, A., & Parker, S. C. (1987). Recreation and leisure: An introductory handbook.

استشهاد بنمط شيكاغو

Graefe, Alan, و Stan C. Parker. Recreation and Leisure: An Introductory Handbook. London, Venture Publishing, 1987.

MLA استشهاد

Graefe, Alan, و Stan C. Parker. Recreation and Leisure: An Introductory Handbook. 1987.