Ritchie, John C., author
William Heinemann, 1975
Buku Teks
Mahoney, Tom, author
Harper & Row, 1966
Buku Teks
Kiyosaki, Robert T., 1947-, author
Gramedia Pustaka Utama, 2005
Buku Teks
Routledge , 1998
Buku Teks
by Lu Yang [and others]
New World Press, 2010
Buku Teks