O`Donnell, Paul D., author
Prentice-Hall, 1952
Buku Teks
Niece, E.H. Mac, author
John Wiley & Sons, 1961; 1957
Buku Teks
Rage, Louis J., author
Scranton, Penn., International Textbook
Buku Teks
White, Kendall C., author
Alexander Hamilton Institute, 1962
Buku Teks
Biegel, John E., author
Prentice-Hall, 1980
Buku Teks