edited by Guido Bolaffi [and others]
Sage, 2003
Buku Teks
edited by William Dodge Lewis, Henry Seidel Canby, Thomas Kite Brown
The John C. Winston company, 1942
Buku Referensi
Merriam-Webster, 2004
Buku Referensi
Macmillan, 1994
Buku Referensi
edited by R.J. Johnston, Derek Gregory, Geraldine Pratt, Michael Watts
Blackwell Publishing, 2000
Buku Referensi