BOOK STEPHEN A. (1977). STATISTICS: BASIC TECHNIQUES FOR SOLVING APPLIED PROBLEMS. MCGRAW-HILL.
Dyfyniad Arddull ChicagoBOOK STEPHEN A. STATISTICS: BASIC TECHNIQUES FOR SOLVING APPLIED PROBLEMS. NEW YORK: MCGRAW-HILL, 1977.
Dyfyniad MLABOOK STEPHEN A. STATISTICS: BASIC TECHNIQUES FOR SOLVING APPLIED PROBLEMS. MCGRAW-HILL, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.