APA (7th ed.) Zitazioa

Hull, C. H., & Nie, N. H. (1981). SPSS update 7-9: New procedures and facilities for releases 7-9. McGraw-Hill.

Chicago Style (17th ed.) Zitazioa

Hull, C. Hadlai, eta Norman H. Nie. SPSS Update 7-9: New Procedures and Facilities for Releases 7-9. New York: McGraw-Hill, 1981.

MLA (9th ed.) Zitazioa

Hull, C. Hadlai, eta Norman H. Nie. SPSS Update 7-9: New Procedures and Facilities for Releases 7-9. McGraw-Hill, 1981.