Pitirim A. Sorokin
Pitirim Sorokin (1889 - 1968) was one of the most important thinkers in the history of Sociology. He was was professor of sociology at the University of Minnesota (1924–30) and at Harvard University (1930–55), where he founded the Department of Sociology.
(1959) Pitirim A. Sorokin and Walter A. Lunden, Power and Morality [English]
Useful link: The Sorokin Foundation