Treece, Marla, author
Allyn and Bacon, 1994
Buku Teks
Ewald, Helen Rothschild, author
Prentice-Hall International, 1997
Buku Teks
Locker, Kitty O., author
McGraw-Hill/Irwin, 2000
Buku Teks
Locker, Kitty O., author
McGraw-Hill, 2013
Buku Teks
Locker, Kitty O., author
Irwin, 1995
Buku Referensi