Beltran, D. G. (1973). A method of determining economical sample size for sample surveys [microform]. Photoduplication Service.
Chicago-referens (17:e uppl.)Beltran, Disodado G. A Method of Determining Economical Sample Size for Sample Surveys [microform]. Quezon City: Photoduplication Service, 1973.
MLA-referens (9:e uppl.)Beltran, Disodado G. A Method of Determining Economical Sample Size for Sample Surveys [microform]. Photoduplication Service, 1973.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.