Cassidy, Harold G.
Freeman, Cooper & Company , 1970
Buku Teks
Taylor and Francis, 2000
Buku Teks
Butler, S. T.
Horwitz, 1960
Buku Teks
Butt, Hans-Jurgen
Wiley-VCH Verlag, 2013
Buku Teks
Wendy Brown ... [and others] ; edited by Jonathan Ling
Longman Singapore Publishers, 1995
Buku Teks