White, Osmar, foreword
Heinemann, 1969
Buku Teks
Shaw, Alan George Lewers, author
Longman, Green, 1955
Buku Teks
Allen & Unwin, 1985
Buku Teks
Garnett, A. Camppell (Arthur Camppell), author
University of Wisconsin Press , [1949]
Buku Teks
Crough, Greg, author
Penguin Books, 1982
Buku Teks