Wren, D. A., & Greenwood, R. G. (1998). Management innovators: The people and ideas that have shaped modern business. Oxford University Press.

Wren, Daniel A., and Ronald G. Greenwood. Management Innovators: The People and Ideas That Have Shaped Modern Business. New York: Oxford University Press, 1998.

Wren, Daniel A., and Ronald G. Greenwood. Management Innovators: The People and Ideas That Have Shaped Modern Business. Oxford University Press, 1998.