Lovejoy, Laurence C., author
Aleander Hamilton Institute, 1962
Buku Teks
Yoder, Dale, author
Prentice-Hall, 1984
Buku Teks
Maier, Norman R.F., author
John Wiley & Sons, 1956
Buku Teks
Yoder, Dale, author
McGraw-Hill, 1958
Buku Teks
Cascio, Wayne F., author
Reston Pub. Co, 1982
Buku Teks