Ogden, Jane, author
Open University Press, 2004
Buku Teks
editor, David F. Marks
Sage Publications, 2002
Buku Teks
Brenner, Charles
Anchor Book, 1973
Buku Teks
Basch, Paul F., author
Oxford University Press , 1999
Buku Teks
W.B. Saunders, 1999
Buku Teks