edited and with a foreword by John Foley, Robert C. Lobdell and Robert Trounson
Mirror Press, 1977
Buku Teks
University of Southern California, 2014
Buku Referensi
Lonely Planet Publication, 2003
Buku Teks
Patterson Smith, 1976
Buku Teks
Bowman, Arthur G.
Prentice-Hall, 1970
Buku Teks