Child, John, author
George Allen and Unwin, 1969
Buku Teks
O`Connor, D.J.
Ure Smith Press , 1991
Buku Teks
Richardson, John E.
Palgrave Macmillan, 2007
Buku Teks
Champion, John M.
Richard D. Irwin, 1985
Buku Teks
Metcalfe, Scoot Amy, author
Information Science Publishing, 2006
Buku Teks