O`Connor, Edwin, author
Little, Brown, 1966
Buku Teks
Murdoch, Anna, author
Morrow, 1988
Buku Teks
S. Richard Sauber, Luciano L' Abate, Gerald R. Weeks, William L. Buchanan
Sage, 1993
Buku Referensi
Martinus Nijhoff, 1968
Buku Teks
Bodanis, David
Simon & Schuster , 1997
Buku Teks