Nunez, Jorge E., author
Routledge, 2017
Buku Teks
MartÃnez-Fraga, Pedro J., author
Cambridge University Press, 2015
Buku Teks
Oppenheim, L.
Longmas, 1955
Buku Teks
edited by Dennis Campbell
Graham & Trotman, 1990
Buku Referensi
McNair, Lord, author
University Press, 1956
Buku Teks