Lilly, J. Robert, author
Sage Publications, 1995
Buku Teks
Bolton, Patrick, author
MIT, 2005
Buku Teks
Scott, Robert E., author
Michie, 1988
Buku Teks
Fried, Charles, author
NY Oxford University Press, 2015
Buku Teks
Ateneo de Manila University, 2002
Buku Teks