Gnap, John J. Easy sleep / John J. Gnap, with Nancy Flaster. - New York : Stein and Day, 1978. - xv, 168 p. ; 22 cm. Includes bibliography. Open access. ISBN: 0812824350 LCCN: 7720879 Subjects--Topical Terms: Insomnia.Behavior modification.Hypnotism--Therapeutic use.