Beltran, D. G. (1963). A method of determining economical sample size for sample surveys.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBeltran, Diosdado G. A Method of Determining Economical Sample Size for Sample Surveys. 1963.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBeltran, Diosdado G. A Method of Determining Economical Sample Size for Sample Surveys. 1963.
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