Cruickshank, Donald R. Teaching is tough / Donald R. Cruickshank and associates. - Englewood Cliffs, N.J. : Prentice-Hall, c1980. - x, 342 p. : ill. ; 21 cm. - A Spectrum book . Includes bibliographies and index. ISBN: 0138934959 0138934878 (pbk.) LCCN: 80014625 //r82 Subjects--Topical Terms: Teaching.Classroom management.Problem solving. LC Class. No.: LB 1025.2 / .C68