edited by Bill Cate
Directory Press, 1972
Buku Teks
Colbeck, I. (Ian), author
Elsevier, 1994
Buku Teks
Gavouneli, Maria
Graham & Trotman, 1995
Buku Teks
Mason, C.F.
Pearson Education ltd, 1996
Buku Teks
De Nevers, Noel, 1932-, author
McGraw-Hill, 2000
Buku Teks