Tool, M. R., & Samuels J. Warren. (1989). The Methodology of economic thought (2nd ed., completely rev.). Transaction Publication.
Lua i Stíl Chicago (17ú heag.)Tool, Marc R., agus Samuels J. Warren. The Methodology of Economic Thought. 2nd ed., completely rev. New Brunswick, New Jersey: Transaction Publication, 1989.
Lua MLA (9ú heag.)Tool, Marc R., agus Samuels J. Warren. The Methodology of Economic Thought. 2nd ed., completely rev. Transaction Publication, 1989.
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