Cavatorta, Francisco, author
Oxford University Press, 2016
eBooks
Kaplan, Burton, author
Prentice-Hall, 1996
Buku Teks
McCormick, Charles Perry, 1896-1970, author
Harper & Brothers, 1952
Buku Teks
East, Roger, author
Routledge, 2006
Buku Referensi
Estrada, Rafael R.
Alemar?s Lawbook Division Manila,, 1957
Buku Teks