Naps, Thomas L., author
Reston Publishing, 1982
Buku Teks
Dock, V. Thomas, author
Reston Publishing, 1973
Buku Teks
Schechter, David, author
Virginia Publishing, 1982
Buku Teks
Smith, Marilyn Z., author
Houghton-Mifflin, 1974
Buku Teks
Seidel, Kenneth P., author
Goodyear , 1971
Buku Teks