Ford, G. (1978). UNISIST guidelines for the conduct of user studies. UNESCO.
Chicago Style aipamenaFord, Geoffrey. UNISIST Guidelines for the Conduct of User Studies. Paris: UNESCO, 1978.
MLA aipamenaFord, Geoffrey. UNISIST Guidelines for the Conduct of User Studies. UNESCO, 1978.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.