by Luigi Pareti ; assisted by Paolo Brezzi and Luciano Petech ; translated from the Italian by Guy E. F. Chilver and Sylvia Chilver ; pt. 1, pt. 2, pt. 3. -- Published for the International Commission for a History of the Scientific and Cultural Development of Mankind by Allen & Unwin, 1965. -- (History of mankind : cultural and scientific development ; v. 2).