Rexroad, Robert A.
John Wiley & Sons, 1983
Buku Teks
Haas, Robert W
Kent, 1982
Buku Teks
Buskirk, Richard Hobart, 1927-, author
Holt Rinehart, 1961
Buku Teks
Buskirk, Richard Hobart, 1927-, author
Holt Rinehart, 1970
Buku Teks
Keegan, Warren J., author
Prentice-Hall, 1980
Buku Teks