Nelson, B. M. W. (1928). State recreation: Parks, forests and game preserves. National conference on State parks, Inc..
Chicago-referens (17:e uppl.)Nelson, Beatrice M. Ward. State Recreation: Parks, Forests and Game Preserves. Washington, D.C.: National conference on State parks, Inc., 1928.
MLA-referens (8:e uppl.)Nelson, Beatrice M. Ward. State Recreation: Parks, Forests and Game Preserves. National conference on State parks, Inc., 1928.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.