edited by R.J. Johnston, Derek Gregory, Geraldine Pratt, Michael Watts
Blackwell Publishing, 2000
Buku Referensi
edited by William Dodge Lewis, Henry Seidel Canby, Thomas Kite Brown
John C. Winston, 1942
Buku Referensi
Papalia, Diane E., author
McGraw-Hill, 2001
Buku Teks
R & R Newkirk/Longman, 1985
Buku Referensi
Bryan A. Garner, editor in chief
West Publishing, 1999
Buku Referensi