Perry, William E. How to test software packages : a step-by-step guide to assuring they do what you want / William E. Perry. - New York : Wiley, c1986. - vii, 231 p. : ill. ; 24 cm. Includes index. LCCN: 85031572 Subjects--Topical Terms: Computer software--Testing. LC Class. No.: QA76.76.T48 / P47 1986 Dewey Class. No.: 001.64 / PEH