Kula, W. (1976). Economic theory of the feudal system: Towards a model of the Polish economy 1500-1800. Verso.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKula, Witold. Economic Theory of the Feudal System: Towards a Model of the Polish Economy 1500-1800. Verso, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKula, Witold. Economic Theory of the Feudal System: Towards a Model of the Polish Economy 1500-1800. Verso, 1976.
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