Sophie Laws, Caroline Harper, Nicola JOnes, Rachel Marcus
SAGE, 2013
Buku Teks
French, Sally
Butterworth-Heinemann, 2001
Buku Referensi
Oades, Lindsay G.
Sage, 2019
Buku Teks
edited by Janet Holmes and Kirk Hazen
John Wiley & Sons, 2014
Buku Teks
Weirich, Thomas
South-Western, 1988
Buku Teks