Sigismondi, Paolo, author
Springer, 2011
eBooks
Korten, David C., author
Kumarian Press, 1990
Buku Teks
Harman, Willis, author
Berrett-Koehler , 1998
Buku Teks
Garcia, Ofelia, author
Wiley-Blackwell , 2009
Buku Teks
Hammond, Allen L., author
Earthscan Publications, 1998
Buku Teks