By Godbey, Geoffrey..
Philadelphia | New York Saunders College Pub. | CBS College Pub. [distributor] 1981 .
viii, 316 p. , Includes index. 0030576733 (CBS College Pub. : pbk.)

By Burunat, Silvia..
New York CBS College Pub. 1984 .
viii, 224 p. 0030631882 (pbk.)