Williamson, H. F., & Smalley, O. A. (1957). Northwestern Mutual Life: A century of trusteeship. Northwestern University Press.
Цитирование в стиле Чикаго (17-е изд.)Williamson, Harold Francis, и Orange A. Smalley. Northwestern Mutual Life: A Century of Trusteeship. Evanston, Ill: Northwestern University Press, 1957.
Цитирование MLA (9-е изд.)Williamson, Harold Francis, и Orange A. Smalley. Northwestern Mutual Life: A Century of Trusteeship. Northwestern University Press, 1957.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.