Dingus, Lowell
Carlton, 2012
Buku Referensi
Brinton, Crane, 1898-1968
The New American Library, 1958
Buku Teks SO
Smith, John Maynard
New Haven Yale University, 1999
Buku Teks
Flemming, Barbara
Brill, 2018
eBooks
Robson, W.W.
Cambridge University Press, 1982
eBooks