Williams, David, author
Sweet & Makwell, 2000
Buku Teks
Friedmann, Wolfgang, 1907-1972, author
Melbourne University Press, 1950
Buku Teks
Goode, Roy, author
Sweet & Maxwell, 2008
Buku Teks
Alsagoff, Syed Ahmad, author
LexisNexis, 2010
Buku Teks
Cook, Franklin Henry
Macmillan, 1951
Buku Teks