Gould, W.T.S., author
John Wiley, Longman Scientific, 1993
Buku Teks
edited by Keith Watson
Croom Helm, 1982
Buku Teks
Dixon, Chris J., author
Routledge, 2015
Buku Teks
Worsley, Peter, author
Weidenfeld and Nicholson, 1978
Buku Teks
Kaushik, Devendra
Sterling Publishers, , 1975
Buku Teks