APA (7th ed.) Zitazioa
Scha, R. J. H. (1983). Logical Foundations for question answering.
Chicago Style (17th ed.) Zitazioa
Scha, Remko Jan Hendrik. Logical Foundations for Question Answering. Groningen, 1983.
MLA (9th ed.) Zitazioa
Scha, Remko Jan Hendrik. Logical Foundations for Question Answering. 1983.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.