Orton, C. W. Previte The shorter Cambridge medieval history / C. W. Previte Orton . - Cambridge : Univeristy Press, 19- 2V. : plates, maps ; 22 cm. Vol.I : The later Roman empire to the 12th C 1960 Vol.I : The later Roman empire to the 12th C, reprt 1962 Vol.II : The 12th C to the Ranaissance 1960 Vol.II : The 12th C to the Ranaissance, reprt 1962
