Niiniluoto, I. (1973). Conceptual enrichment, theories and inductive systematization. Suomalainen Tiedeakatemia : Distributor, the Academic Bookstore.
Citace podle Chicago (17th ed.)Niiniluoto, Ilkka. Conceptual Enrichment, Theories and Inductive Systematization. Helsinki: Suomalainen Tiedeakatemia : Distributor, the Academic Bookstore, 1973.
Citace podle MLA (8th ed.)Niiniluoto, Ilkka. Conceptual Enrichment, Theories and Inductive Systematization. Suomalainen Tiedeakatemia : Distributor, the Academic Bookstore, 1973.
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