Smedley, Agnes, author
The Vanguars Press, 1934
Buku Teks
Lindesay, William, author
Odyssey Publications, 1998
Buku Referensi
O`Ballance, Edgar
Frederick A. Praeger, 1964
Buku Teks
O`Ballance, Edgar
Frederick A. Praeger, 1964
Buku Teks
Gale, George Stafford, author
Allen & Unwin, 1955
Buku Teks