Jones, David P., author
Carswell, 2009
Buku Teks
Lorch, Robert S., author
Wayne State University Press, 1969
Buku Teks
Carroll, Alex, 1947-, author
Pearson Longman, 2007
Buku Teks
Tracey, Richard R.S., author
Butterworth, 1975
Buku Teks
De Smith, S.A. (Stanley A.), author
Penguin Books, 1994
Buku Teks