APA (7e ed.) Bronvermelding

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..

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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