Bengtson, N. A., & Van Royen, W. (1964). Fundamentals of economic geography: An introduction to the study of resources. Prentice-Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBengtson, N. A., और William Van Royen. Fundamentals of Economic Geography: An Introduction to the Study of Resources. Englewood Cliffs, NJ: Prentice-Hall, 1964.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBengtson, N. A., और William Van Royen. Fundamentals of Economic Geography: An Introduction to the Study of Resources. Prentice-Hall, 1964.
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