Douglas, Lloyd V.
Prentice-Hall, 1965
Buku Teks
Carlile, Paul R., author
Emerald, 2016
eBooks
Kiyosaki, Robert T., 1947-, author
Gramedia Pustaka Utama, 2005
Buku Teks
Gordon, Robert Aaron, author
Columbia University Press, 1959
Buku Teks
Pierson, Frank C.
McGraw-Hill, 1959
Buku Teks