Patton, Kevin T.
Mosby Elsevier, 2010
Buku Referensi
Krebs, Charles J., author
Harper Collins, 1989
Buku Teks
John Wiley & Sons, 2004
Buku Teks
Christensen, Larry B., 1941-, author
Allyn and Bacon, 1988
Buku Teks
Robinson, James R., author
Blackwell Scientific, 1975
Buku Teks