Weismantel, Guy E., editor
Buku Teks
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, author
Blackwell Publishers, 1998
Buku Teks