Graham, Andrew
Macmillan, 1956
Buku Teks
Gardner, Mona
Harcourt, Brace & company, 1939
Buku Teks
Thompson, Virginia
George Allen & Unwin, 1937
Buku Teks
Janse, Olov R.T., author
St-Catherine Press, 1958
Buku Teks
The Hongkong Daily Press, 1931
Buku Referensi