by P. Doyle [and others]
Harper & Row, c1974
Buku Teks
Howard, John A., author
Richard D. Irwin, 1957
Buku Teks
Keegan, Warren J., author
Prentice Hall of India, 1982
Buku Teks
Rexroad, Robert A.
John Wiley & Sons, 1983
Buku Teks
Wilson, R. M. S., author
Heinemann, 1973
Buku Teks