By Tifft, Susan E.. New York : Summit Books, 1991 . 574 p., [16] p. of plates : 0671631675
]]>By Pine, L. G. (Leslie Gilbert), 1907-. Newton Abbot : David & Charles, 1969 0715344730
]]>By Wrigley, E. A. (Edward Anthony), 1931-. London : Arnold, 1973 , Includes index. 0713156945
]]>By Bulliet, Richard W.. Cambridge, Mass., Harvard University Press, 1972 , "This book began as a doctoral dissertation." 0674657926
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