Callaghan, Morley, author
Macmillan of Canada, 1959
Buku Teks
Callaghan, Morley, author
Koleksi Publik
Callaghan, Barry
General Publishing Co. Limited, 1978
Buku Teks
Clarke, Marcus, author
Hale & Iremonger, c1983
Buku Teks
O`Callaghan, Paul W.
Pergamon Press , 1978
Buku Teks