Não informado. (1971). IDS Communication. University of Sussex, Institute of Development Studies.
Chicago-viite (17. p.)Não informado. IDS Communication. Brighton, Inglaterra: University of Sussex, Institute of Development Studies, 1971.
MLA-viite (8. p.)Não informado. IDS Communication. University of Sussex, Institute of Development Studies, 1971.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.