Cita APA (7th ed.)

Verba, S., & Nie, N. H. Participation in America: Political democracy an social equality. University of Chicago Press.

Cita Chicago (17th ed.)

Verba, Sidney, i Norman H. Nie. Participation in America: Political Democracy an Social Equality. Chicago: University of Chicago Press.

Cita MLA (9th ed.)

Verba, Sidney, i Norman H. Nie. Participation in America: Political Democracy an Social Equality. University of Chicago Press.