Biaug, Mark
Cambridge University Press, 1986
Buku Teks
Schumpeter, Joseph A.
Routledge , 1997
Buku Teks
edited by John Canning
Taplinger, 1967
Buku Referensi
Nyanaponika, Thera, author
Wisdom Publications, 2003
Buku Teks
Weitzman, David, author
Charles Seribner's Sond, 1994
Buku Referensi