edited by William Dodge Lewis, Henry Seidel Canby, Thomas Kite Brown
John C. Winston, 1942
Buku Referensi
Papalia, Diane E.
McGraw-Hill, 2001
Buku Teks SO
R & R Newkirk/Longman, 1985
Buku Referensi
Bryan A. Garner, editor in chief
West Publishing, 1999
Buku Referensi
Collin, P. H.
Peter Collin Publishing, 1997
Buku Referensi