Hardy, Frank
Gold Star Publication, 1971
Koleksi Publik
Palmer, Vance
Longman Cheshire, 1981
Buku Teks
Eldershaw, M. Barnard.
Harcourt, Brace and company, 1929
Buku Teks
Hardy, Frank
Gold Star Publication, 1971
Buku Teks
Astley, Thea
Angus and Robertson, 1960
Buku Teks