SULLIVAN, W. G. (1977). Fundamentals Of Forecasting William G. Sullivan And Wayne Claycombe. Reston Publishing Company.
Chicago-viite (17. p.)SULLIVAN, William G. Fundamentals Of Forecasting William G. Sullivan And Wayne Claycombe. Reston Publishing Company, 1977.
MLA-viite (8. p.)SULLIVAN, William G. Fundamentals Of Forecasting William G. Sullivan And Wayne Claycombe. Reston Publishing Company, 1977.
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