Herbert, Xavier, 1901-1984
Collins, 1977
Buku Teks
Freixas, Xavier
Massachusetts Massachusetts Institute of Technology 1997, 1997
Buku Teks
Baylon, Christian
Nathan Universite, 1991
Buku Teks
Brandes, Joseph
University of Pittsburgh Press, 1962
Buku Teks
Little, Brown & Co., 1998
Buku Teks