Routunda, Ronald D.
West, 2007
Buku Teks
Kauper, Paul G., author
Little, Brown, 1971
Buku Teks
Cushman, Robert E., author
Appleton-Century-Crofts, 1963
Buku Teks
Barrett, Edward L., author
Foundation Press, 1977
Buku Teks
Kauper, Paul G., author
Little, Brown, 1966
Buku Teks