Strigel, W. H. e., & Strigel, W. H. (1977). Lecture Notes in Economics and Mathematical System: No.146 - in search of economic indicators; essays on business surveys. Springer-Verlag.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रStrigel, Werner H. ed, और Werner H. Strigel. Lecture Notes in Economics and Mathematical System: No.146 - in Search of Economic Indicators; Essays on Business Surveys. Springer-Verlag, 1977.
एमएलए (9वां संस्करण) प्रशस्ति पत्रStrigel, Werner H. ed, और Werner H. Strigel. Lecture Notes in Economics and Mathematical System: No.146 - in Search of Economic Indicators; Essays on Business Surveys. Springer-Verlag, 1977.
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