Humphreys, Nick, author
Blackstone Press, 1999
Buku Teks
Smith, E. Owen
Pan Books , 1971
Buku Teks
Rees, Albert, author
University of Chicago Press, 1962
Buku Teks
Goldstein, Joseph, author
Allen & Unwin, 1952
Buku Teks
Barbash, Jack, author
John Hopkins Press, 1972
Buku Teks