Niiniluoto, I. (1973). Conceptual enrichment, theories and inductive systematization. Suomalainen Tiedeakatemia : Distributor, the Academic Bookstore.
Chicago-referens (17:e uppl.)Niiniluoto, Ilkka. Conceptual Enrichment, Theories and Inductive Systematization. Helsinki: Suomalainen Tiedeakatemia : Distributor, the Academic Bookstore, 1973.
MLA-referens (8:e uppl.)Niiniluoto, Ilkka. Conceptual Enrichment, Theories and Inductive Systematization. Suomalainen Tiedeakatemia : Distributor, the Academic Bookstore, 1973.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.