Nelson, B. M. W. (1928). State recreation: Parks, forests and game preserves. National conference on State parks, Inc..
Lua i Stíl Chicago (17ú heag.)Nelson, Beatrice M. Ward. State Recreation: Parks, Forests and Game Preserves. Washington, D.C.: National conference on State parks, Inc., 1928.
Lua MLA (8ú heag.)Nelson, Beatrice M. Ward. State Recreation: Parks, Forests and Game Preserves. National conference on State parks, Inc., 1928.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.