Buku Teks
Departemen Pertambangan, 1977
Buku Teks
Departemen Pertambangan , 1980
Buku Teks
edited by Frank A. Oski, James A. Stockman
Year Book Medical Publ. Comp., 1983
Buku Teks
Foreign and Commonwealth Office
Her Majesty's Stationery Office, 1986
Buku Referensi