Welsch, Glenn A., author
Richard D. Irwin, 1984
Buku Teks
Huefner, Ronald J., author
Dryden Press, 1986
Buku Teks
May, George O., author
Macmillan, 1959
Buku Teks
Lewis, Richard, author
Pitman Books, 1983
Buku Teks
Hilman, A. Douglas, author
Dryden Press , 1986
Buku Teks