Cita APA (7a ed.)

National Recreation Association (U.S.) & Lee, J. (1977). The normal course in play: Practical material for use in the training of playground and recreation workers. McGrath Pub. Co..

Cita Chicago Style (17a ed.)

National Recreation Association (U.S.) y Joseph Lee. The Normal Course in Play: Practical Material for Use in the Training of Playground and Recreation Workers. Washington: McGrath Pub. Co., 1977.

Cita MLA (8a ed.)

National Recreation Association (U.S.) y Joseph Lee. The Normal Course in Play: Practical Material for Use in the Training of Playground and Recreation Workers. McGrath Pub. Co., 1977.