Trigger, Bruce G.
Cambridge University Press, 1989
Buku Teks
Christopher Ehret and Merrick Posnansky edited by
University of California Press, 1982
Buku Teks
edited by Isaac Kramnick
[publisher not identified], 1969
Buku Teks
Wanlass, Lawrence C.
Appleton-Century-Crofts, 1953
Buku Teks
Thomas, Edward J. (Edward Joseph)
Routledge & Kegan Paul, 1951
Buku Teks