Drummond, Marshall E., author
Wadsworth, 1973
Buku Teks
Dock, V. Thomas, author
Reston Publishing, 1973
Buku Teks
Mcquillen, Kevin, author
Mike Murach & Associates, 1975
Buku Teks
Smith, Marilyn Z., author
Houghton-Mifflin, 1974
Buku Teks
Bernard, Solomon Martin, author
Prentice-Hall, 1968
Buku Teks