Gallwey, Timothy Josep, author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
edited by Sandy Weinberg
Informa Healtcare, 2007
Buku Teks
Frantz, Harper W., author
W.H. Freeman, 1968
Buku Teks
McKnight, Kent H.
"Minnesota: Burgess, 1968",
Buku Teks
Newman, Melvin S., author
Macmillan, 1972
Buku Teks