Hogbin, Herbert Ian, author
Routledge and Kegan Paul, 1951
Buku Teks
Sydney University Press, 1974
Buku Teks
Robson, R.W., author
Pacific Publications PTY, 1954
Buku Teks
Mytinger, Caroline
Macmillan, 1946
Buku Teks
Wilson, Lindsay
McGraw-Hill , 1975
Buku Teks