Jones, John G.
Alexander Hamilton Institute, 1961
Buku Teks
Storholm, Gordon R.
Prentice-Hall, 1982
Buku Teks
Stanton, William J.
Richard D. Irwin, 1978
Buku Teks
Stanton, William J.
Richard D. Irwin, 1964
Buku Teks
Shapiro, Benson P.
McGraw-Hill, 1977
Buku Teks