Hesseling, P. (1982). Effective organization research for development. Pergamon.
Lua i Stíl Chicago (17ú heag.)Hesseling, Pjotr. Effective Organization Research for Development. Oxford: Pergamon, 1982.
Lua MLA (9ú heag.)Hesseling, Pjotr. Effective Organization Research for Development. Pergamon, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.