Platts, John T.
Sampson Low, Marston, 1959
Buku Referensi
Oxford University Press, New York
Buku Referensi
Peter Salim
Modern English Press, 1991
Buku Referensi
Corsini, Raymond J.
Brunner-Routledge, 2002
Buku Teks
Winick, Charles
Littlefield, Adams & Co., 1961
Buku Referensi