Jones, Janice, author
Erlangga, 2009
Buku Referensi
Gambrill, Eileen, author
John Wiley & Sons, 2012
Buku Teks
Groarke, Leo, author
Oxford University Press , 1997
Buku Teks
Huddak, Carolyn M
Lippincot , 1982
Buku Teks
Mason, Celestine B.
Van Nostrand Reinhold, 1987
Buku Teks