Gallwey, Timothy Josep, author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
edited by Bruce W. Burkhart and Wesley S. Thompson
Burgess Publishing, 1972
Buku Teks
Norstog, Knut, author
Northern Illinois University, 1969
Buku Teks
Deason, Temp R., author
Burgess, 1968
Buku Teks
Oborne, David J., author
John Wiley & Sons, 1995
Buku Teks