Leese, Joseph
Harper & Row, 1961
Buku Teks
Taba, Hilda, author
Harcourt Brece & World, 1962
Buku Teks
Nicholls, Audrey, author
George Allen and Unwin, 1972
Buku Teks
Lucas, A.M.
Australia International Press , 1979
Buku Teks
Rash, J. Keogh
John Wiley & Sons, 1979
Buku Teks