Wirosardjono, S. (1973). On the theory of systematic cluster sampling with probability proportional to size [microform]. Photoduplication Service.
Chicago-referens (17:e uppl.)Wirosardjono, Soetjipto. On the Theory of Systematic Cluster Sampling with Probability Proportional to Size [microform]. Quezon City: Photoduplication Service, 1973.
MLA-referens (9:e uppl.)Wirosardjono, Soetjipto. On the Theory of Systematic Cluster Sampling with Probability Proportional to Size [microform]. Photoduplication Service, 1973.
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