Butzer, Karl W., author
Cambridge University Press, 1982
Buku Teks
Treshow, Michael, author
McGraw-Hill, 1976
Buku Teks
edited by Jonathan Rigg
Archipelago Press, 1996
Buku Teks
Boughey, Arthur S., author
McMillan Publisher, 1975
Buku Teks
edited by Amos Rapoport
Angus and Robertson , 1972
Buku Teks