Plutchik, Robert Foundations of experimental research / Robert Plutchik. - 3rd ed. - New York : Harper & Row, Publishers, c1983. - xiv, 253 p. : ill. ; 23 cm. - (Harper's experimental psychology series) . Includes index. ISBN: 006045265X Subjects--Topical Terms: Psychology, Experimental.Psychological research. LC Class. No.: BF181 / .P68 1983