Ebenstein, William, author
Thomson Learning, 2000
Buku Teks
Ahmad Suhelmi, author
Gramedia Pustaka Utama, 2004
Buku Teks
Hacker, Andrew
McGraw-Hill, 1973
Buku Teks
Commons, John R.
The University of Wisconsin Press, 1961
Buku Teks
Maxey, Chester C., author
Macmillan, 1961
Buku Teks