Rose, Arnold M., author
University of Minnesota Press , 1958
Buku Teks
Alfred A. Knopf, 1951
Buku Teks
Diamond, Jared, author
Norton, 2005
Buku Teks
Lorimer, Frank
Unesco, 1958
Buku Teks
Greif, Avner, author
Cambridge University Press, 2005
Buku Teks