Ryan, B. F. (1992). MINITAB handbook (Second edition, revised.). PWS-Kent Pub. Co.
Lua i Stíl Chicago (17ú heag.)Ryan, Barbara F. MINITAB Handbook. Second edition, revised. Boston: PWS-Kent Pub. Co, 1992.
Lua MLA (9ú heag.)Ryan, Barbara F. MINITAB Handbook. Second edition, revised. PWS-Kent Pub. Co, 1992.
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