Souter, Gerry
Andre Deutsch, 2015
Buku Referensi
Bodard, Lucien
Atlantic Monthly Press Book, 1967
Buku Teks
Moyar, Mark
Cambridge University Press, 2006
Buku Teks
Knoebl, Kuno
Frederick A. Praeger , 1967
Buku Teks
Lawrence, Mark Atwood
Oxford University Press, 2010
Buku Teks