Pesek, Boris P.
Harvester. Wheatshaf, 1988
Buku Teks
Stanford, Jon D.
John Wiley & Sons, 1973
Buku Teks
Kamerschen, David R.
South-Western Publishing, 1992
Buku Teks
Barger, Harold
Rand McNally, 1969
Buku Teks
Mishkin, Frederick S.
Pearson Education, 2013
Buku Teks