Williamson, H. F., & Smalley, O. A. (1957). Northwestern Mutual Life: A century of trusteeship. Northwestern University Press.
Dyfyniad Arddull ChicagoWilliamson, Harold Francis, and Orange A. Smalley. Northwestern Mutual Life: A Century of Trusteeship. Evanston, Ill: Northwestern University Press, 1957.
Dyfyniad MLAWilliamson, Harold Francis, and Orange A. Smalley. Northwestern Mutual Life: A Century of Trusteeship. Northwestern University Press, 1957.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.