Howard, John A., author
Richard D. Irwin, 1973
Buku Teks
Kallaus, Norman Francis, 1924-, author
South-Western Publishing, 1987
Buku Teks
Terry, George Robert, author
Richard D. Irwin, 1975
Buku Teks
Pfifner, John M., author
Prentice-Hall, 1960
Buku Teks
Robbins, Stephen P., author
Prentice-Hall, 1997
Buku Teks