Ruthenberg, H. (1968). Smallholder farming and smallholder development in Tanzania: Ten case studies. Weltforum Verlag.
Lua i Stíl Chicago (17ú heag.)Ruthenberg, Hans. Smallholder Farming and Smallholder Development in Tanzania: Ten Case Studies. Munchen: Weltforum Verlag, 1968.
Lua MLA (8ú heag.)Ruthenberg, Hans. Smallholder Farming and Smallholder Development in Tanzania: Ten Case Studies. Weltforum Verlag, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.