edited by Guy E. Weismantel
McGraw-Hill, 1981
Buku Referensi
Charles A. Harper, editor-in-chief
McGraw-Hill, 2001
Buku Referensi
edited by Michael Rines
Gower in Association with Marketing Magazine, 1981
Buku Teks
Coulmas, Florian
Blackwell Publishers, 1998
Buku Teks
Edson, Gary
Routledge, 1996
Buku Referensi