WILLIAMSON, H. F. (1970). Economic Development Principles And Patterns Harold F Williamson And John A. Buttrics. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)WILLIAMSON, Harold F. Economic Development Principles And Patterns Harold F Williamson And John A. Buttrics. Prentice-Hall, 1970.
Lua MLA (8ú heag.)WILLIAMSON, Harold F. Economic Development Principles And Patterns Harold F Williamson And John A. Buttrics. Prentice-Hall, 1970.
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