Sophie Laws, Caroline Harper, Nicola JOnes, Rachel Marcus
SAGE, 2013
Buku Teks
Denscombe, Martyn, author
Open University Press, 2012
Buku Teks
French, Sally, author
Butterworth-Heinemann, 2001
Buku Referensi
Oades, Lindsay G., author
Sage, 2019
Buku Teks
edited by Janet Holmes and Kirk Hazen
John Wiley & Sons, 2014
Buku Teks