Nauki polityczne, ekonomia.

Politolog.

An introduction to American government / Kenneth Prewitt, Sidney Verba. - Cambridge, 1983. (Social Science Research Council, Harvard University)

LCA online

Crises and sequences in political development / Leonard Binder [et al.]. - Princeton, 1971. Biogram z błędną datą ur. (Sidney Verba, born in New York, 1926)

en.wikipedia, 12.04.2019 https://en.wikipedia.org/wiki/Sidney_Verba