"International Systems: Peace, Conflict Resolution, and Politics" (1975) by Kenneth Boulding (p. 375), as quoted in "Non-offensive defence for the twenty-first century" by Bjørn Møller, Håkan Wiberg, (p. 36), 1994.
"The theory of the firm in the last ten Years" by Kenneth E. Boulding in "The American Economic Review", Volume 32, No. 4 (pp. 791-802), December 1942.