CHATFIELD CHRISTOPHER. (1978). STATISTICS FOR TECHONOLOGY (2ND.). CHAPMAN & HALL.
Lua i Stíl Chicago (17ú heag.)CHATFIELD CHRISTOPHER. STATISTICS FOR TECHONOLOGY. 2ND. LONDON: CHAPMAN & HALL, 1978.
Lua MLA (9ú heag.)CHATFIELD CHRISTOPHER. STATISTICS FOR TECHONOLOGY. 2ND. CHAPMAN & HALL, 1978.
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