Taylor, Sandie
Routledge, 2019
Buku Teks SO
edited by Graham Davies and Anthony Beech
BPS Blackwell, 2012
Buku Teks SO
edited by Grover Maurice Godwin
CRC Press, 2001
Buku Teks
edited by Grover Maurice Godwin
CRC Press, 2001
Buku Teks SO
Wrightsman, Lawrence S.
Wadsworth/Thomson Learning, 2001
Buku Teks SO