Cornell University Press, 1950
Buku Teks
Maclennan, Hugh
Macmillan Co. , 1945
Buku Teks
Thomas, Hugh
Harper & Row, 1967.
Buku Teks
Davies, Hugh Sykes
Published for the British Council by Longmans, Green, 1960
Buku Teks
Jones, Hugh
Routledge, 1996
Buku Teks