Roberts, Geoffrey
Manchester University Press, 1984
Buku Teks
Rothman, Stanley
Bobbs-Merril Company, 1970
Buku Teks
Gunther, John, 1901-1970, author
Harper & Brothers, 1961
Buku Teks
Gunther, John, 1901-1970, author
Harper & Brother, 1962
Buku Teks
edited by Steven Muller
Macmillan, 1963
Buku Teks