Dollin, Stuart, author
The Templar Company, 1992
Buku Referensi
UTZ, Peter, author
Prentice-Hall, 1982
Buku Teks
Springhouse Corporation, 2001
Buku Referensi
Brewer, Dennis, 1949-, author
McGraw-Hill, 2012
Buku Teks
Johnson, Joyce Young, author
Lippincott , 1998
Buku Teks