Forrest, Thomas, author
Oxford University Press, 1969
Buku Teks
Robson, R.W., author
Pacific Publications PTY, 1954
Buku Teks
Wilson, Lindsay
McGraw-Hill , 1975
Buku Teks
Mytinger, Caroline
Macmillan, 1946
Buku Teks
edited by David Pickell; text and photographs by Kal Muller
Periplus, 1994
Buku Referensi