WILLIAMSON, H. F. (1970). Economic Development Principles And Patterns Harold F Williamson And John A. Buttrics. Prentice-Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWILLIAMSON, Harold F. Economic Development Principles And Patterns Harold F Williamson And John A. Buttrics. Prentice-Hall, 1970.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWILLIAMSON, Harold F. Economic Development Principles And Patterns Harold F Williamson And John A. Buttrics. Prentice-Hall, 1970.
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