Carroll, Alex, 1947-
Pearson Longman, 2007
Buku Teks SO
De Smith, S.A. [Stanley A.]
Penguin Books, 1994
Buku Teks SO
De Smith, S.A. [Stanley A.]
Penguin Education, 1973
Buku Teks SO
Phillips, O. Hood
Sweet & Maxwell, 2001
Buku Teks SO
Phillips, O. Hood
Swett and Maxwell, 1973
Buku Teks SO