Scientific method in psychology / Clarence W. Brown, Edwin E. Ghiselli. Brown, Clarence W., 1902- Ghiselli, Edwin E. (Edwin Ernest), 1907- Psychology Methodology. BF38 .B69 150.18 19 Includes bibliographies and index. New York : McGraw-Hill, 1955. 1955. 1955 Text 368 p. : eng McGraw-Hill series in psychology