Anderson, John D., author
McGraw-Hill Education, 2017
Buku Teks
Lee, Ann, author
Limkokwing Univerity of Creative Technology, 2008
Buku Referensi
Andrews, V.C., author
Pocket Books, 2003
Buku Teks
Kidd, Sue Monk, author
Tinder Press, 2014
Buku Teks
James, Henry, 1843-1916, author
Random House , 1997
Buku Referensi