Cita APA (7th ed.)

Williamson, E. G., & Cowan, J. L. (1966). The American student's freedom of expression: A research appraisal. University of Minnesota Press.

Cita Chicago (17th ed.)

Williamson, Edmund Griffith, i John L. Cowan. The American Student's Freedom of Expression: A Research Appraisal. Minneapolis: University of Minnesota Press, 1966.

Cita MLA (8th ed.)

Williamson, Edmund Griffith, i John L. Cowan. The American Student's Freedom of Expression: A Research Appraisal. University of Minnesota Press, 1966.