Author's Small groups and political behavior, 1961.

Biog. resource center (Contemp. authors), Apr. 22, 2009 (Sidney Verba; b. May 26, 1932, Brooklyn, N.Y.; Princeton University, Ph. D., 1959; Harvard University, professor of government, 1972- )

The Harvard gazette, viewed online 12 March 2019: Sidney Verba dies at 86, dated March 7, 2019 (d. Monday [March 4, 2019] in Cambridge; "one of the world's most prominent political scientists"; Carl H. Pforzheimer University Professor Emeritus and research professor of government; graduated from Harvard College, 1953)

El diseño de la investigación social:la inferencia científica en los estudios cualitativos, 2000: title page (Sidney Verba)