Não informado. (1971). IDS Communication. University of Sussex, Institute of Development Studies.
Chicago-referens (17:e uppl.)Não informado. IDS Communication. Brighton, Inglaterra: University of Sussex, Institute of Development Studies, 1971.
MLA-referens (8:e uppl.)Não informado. IDS Communication. University of Sussex, Institute of Development Studies, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.