Springer, 2012
eBooks
Koren, Gideon author
McGraw-Hill, 2007
Buku Referensi
edited by Aileen MacLaren
Springhouse corporation, 1992
Buku Referensi
by Billie Ann Wilson ... [and others]
Prentice-Hall, 2007
Buku Teks
edited by Michael Rines
Gower in Association with Marketing Magazine, 1981
Buku Teks