APA (7th ed.) Zitazioa

Williams, C. T. (1979). Elements of research: A guide for writers. Alfred.

Chicago Style (17th ed.) Zitazioa

Williams, Carol T. Elements of Research: A Guide for Writers. Sherman Oaks: Alfred, 1979.

MLA (9th ed.) Zitazioa

Williams, Carol T. Elements of Research: A Guide for Writers. Alfred, 1979.