Hull, C. H., & Nie, N. H. (1981). SPSS update 7-9: New procedures and facilities for releases 7-9. McGraw-Hill.
Chicago-čujuhus (17. p.)Hull, C. Hadlai, juo Norman H. Nie. SPSS Update 7-9: New Procedures and Facilities for Releases 7-9. New York: McGraw-Hill, 1981.
MLA-čujuhus (9. p.)Hull, C. Hadlai, juo Norman H. Nie. SPSS Update 7-9: New Procedures and Facilities for Releases 7-9. McGraw-Hill, 1981.
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