[T.t.] [t.p.] 1975
Buku Teks
Office of Research and Publications Loyola Schools,
Majalah, Jurnal, Buletin
edited by H.M. Blalock
Aldine Publishing, 1974
Buku Teks
edited by N. Roberts
Butterworth, 1977
Buku Teks SO
edited, Bridget Somekh, Cathy Lewin
Sage Publications , 2005
Buku Teks