edited by Ralph Cohen
Sheridan Press, 1989
Buku Referensi
Ryan, Michael, 1951-
Wiley-Blackwell, 2017
Buku Teks SO
edited by Julie Rivkin and Michael Ryan
John Wiley & Sons, 2017
Buku Teks SO
M. A. R. Habib
Cambridge University Press, 2018
eBooks
Eagleton, Terry
Blackwell Publishers, 1996
Buku Teks SO