Citazione Stile APA (7a Edizione)

Williamson, H. F., & Smalley, O. A. (1957). Northwestern Mutual Life: A century of trusteeship. Northwestern University Press.

Citazione stile Chigago Style (17a edizione)

Williamson, Harold Francis, e Orange A. Smalley. Northwestern Mutual Life: A Century of Trusteeship. Evanston, Ill: Northwestern University Press, 1957.

Citatione MLA (9a ed.)

Williamson, Harold Francis, e Orange A. Smalley. Northwestern Mutual Life: A Century of Trusteeship. Northwestern University Press, 1957.