Grime, Robert P., author
Sweet and Maxwell, 1978
Buku Teks
Farrar, Harry, author
The Donnington Press, 1970
Buku Teks
Hill, Christopher, author
LLP, 2003
Buku Teks
Marsh, S.B., author
MCGraw-Hill, 1995
Buku Teks
Curzon, L.B., author
Pitman, 1994
Buku Referensi