Mansfield, E. (1968). The economics of technological change ([1st ed.].). W. W. Norton.
Lua i Stíl Chicago (17ú heag.)Mansfield, Edwin. The Economics of Technological Change. [1st ed.]. New York: W. W. Norton, 1968.
Lua MLA (9ú heag.)Mansfield, Edwin. The Economics of Technological Change. [1st ed.]. W. W. Norton, 1968.
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