Presley, John W., author
Holt, Rinehart and Winston, 1980
Buku Teks
edited by Alan Bullock and R.B. Woodings
Fontana Paperbacks, 1983
Buku Referensi
Haywood, John A., author
E.J. brill, 1960
Buku Teks
Giuliano Lancioni, Lidia Bettini, editor
Martinus Nijhoff Publishers, 2011
Buku Teks
Wortabet, John, author
Frederick Ungar Publishing, 1954
Buku Referensi