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
De Smith, S.A. (Stanley A.), author
Penguin Education, 1973
Buku Teks