Παραπομπή σε μορφή APA (7η εκδ.)

Beltran, D. G. (1973). A method of determining economical sample size for sample surveys [microform]. Photoduplication Service.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Beltran, Disodado G. A Method of Determining Economical Sample Size for Sample Surveys [microform]. Quezon City: Photoduplication Service, 1973.

Παραπομπή σε μορφή MLA (9th εκδ.)

Beltran, Disodado G. A Method of Determining Economical Sample Size for Sample Surveys [microform]. Photoduplication Service, 1973.