Simpson, I. (1988). Basic statistics for librarians (3rd. ed.). Librarian Association Publ.
Chicago-viite (17. p.)Simpson, I.S. Basic Statistics for Librarians. 3rd. ed. Librarian Association Publ, 1988.
MLA-viite (8. p.)Simpson, I.S. Basic Statistics for Librarians. 3rd. ed. Librarian Association Publ, 1988.
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