Cambridge, Mass. : Harvard University Press, 1972.
Cambridge, Mass. : Harvard University Press, 1972.
Princeton, N.J. : Princeton University Press, [1977]
Dumbarton Oaks papers, 2009-01, Vol.63, p.1-14
Dumbarton Oaks papers, 1995-01, Vol.49, p.73-98
Dumbarton Oaks papers, 1992-01, Vol.46, p.165-176