"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.
"A Note on the Theory of the Black Market" by Kenneth E. Boulding in "The Canadian Journal of Economics and Political Science", Volume 13, No. 1 (pp. 115-118), www.jstor.org. February 1947.