edited by Yiorgos Apostolopoulos, Stella Leivadi and Andrew Yiannakis
Routledge, 1996
Buku Teks
edited by Elisabeth Kals and Jurgen Maes
Springer, 2012
eBooks
Smith, Barry D.
Prentice-Hall, 1982
Buku Teks SO
John Wiley & Sons, 2000
Buku Teks SO
Higgs, Zana Rae
FA. Davis, 1985
Buku Teks SO