Gironiere, Paul P. de la
A Burke-Mailhe Publication, 1972
Buku Teks
Steinberg, David J. (David Joel), author
Westeriew Press, 1990
Buku Teks
Romero, Flerida Ruth P., author
U.P. Law Center, 1981
Buku Teks
Saniel, Josefa M., author
University of the Philippines, 1963
Buku Teks
Corpuz, Onofre D.
Prentice-Hall, 1965
Buku Teks