edited by Mark A. Jervis
Springer, 2005
Buku Teks
Berenbaum, May R., author
Addison-Wesley, 1995
Buku Teks
edited by Frederick W. Stehr
Kendall/Hunt, 1991
Buku Teks
Tauber, Maurice J.
Oxford University Press, 1986
Buku Teks
Sola, Eugenio, author
GHSNP Management Project, 2005
Buku Teks