Healy, Karen, author
Palgrave Macmillan, 2005
Buku Teks
Annette Fitzsimons ... (et al.)
Learning Matters, , 2011
Buku Teks
Irvine, Elizabeth E., author
Pergamon Press, 1979
Buku Teks
Klenk, Robert W.
Wadsworth, 1974
Buku Teks
Klenk, Robert W
Wadsworth, 1970
Buku Teks