Style de citation APA

Vinal, W. G. (1963). Nature recreation: Group guidance for the out-of-doors (2.).

Style de citation Chicago

Vinal, William Gould. Nature Recreation: Group Guidance for the Out-of-doors. 2. Dover Publcations, New York, 1963.

Style de citation MLA

Vinal, William Gould. Nature Recreation: Group Guidance for the Out-of-doors. 2. 1963.