Bedi, R. D. (1969). Theory, history, and practice of co-operation ([7th rev. ed.].). Loyal Book Depot.
Lua i Stíl Chicago (17ú heag.)Bedi, R. D. Theory, History, and Practice of Co-operation. [7th rev. ed.]. Meerut: Loyal Book Depot, 1969.
Lua MLA (8ú heag.)Bedi, R. D. Theory, History, and Practice of Co-operation. [7th rev. ed.]. Loyal Book Depot, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.