Loux, Michael J., author
Routledge, 2002
Buku Teks
Vaske, Martin O.
McGraw-Hill, 1963
Buku Teks
Bakker, Anton, author
Kanisius, 1992
Buku Teks
Matgioi
Éditions traditionnelles, 1936
Buku Teks
Taylor, Richard
Englewood Cliffs : A Simon & Schuster, 1992
Buku Teks