Sterba, James P.,, author
Thomson, 2003
Buku Teks
Osborne, Harold
London Routledge & Kegan Paul 1955
Buku Teks
Berenson, Bernard, 1865-1959, author
Doubleday Anchor Books, 1953
Buku Teks
Wallace, Catherine, author
1992
Buku Teks
Wallace, Catherine, author
Oxford University Press, 1993
Buku Teks