Wirosardjono, S. (1973). On the theory of systematic cluster sampling with probability proportional to size [microform]. Photoduplication Service.
芝加哥风格引文Wirosardjono, Soetjipto. On the Theory of Systematic Cluster Sampling with Probability Proportional to Size [microform]. Quezon City: Photoduplication Service, 1973.
MLA引文Wirosardjono, Soetjipto. On the Theory of Systematic Cluster Sampling with Probability Proportional to Size [microform]. Photoduplication Service, 1973.
警告：这些引文格式不一定是100％准确.