Leger, A.S. St., author
Open UNiversity Press, 1999
Buku Teks
Sophie Laws, Caroline Harper, Nicola JOnes, Rachel Marcus
SAGE, 2013
Buku Teks
Bell, Judith, author
McGraw-Hill Education, 2014
Buku Teks
Brewerton, Paul
Sage, 2004
Buku Teks
Kellett, Mary, author
Paul Chapman Publishing, 2005
Buku Teks