Torga, Miguel, author
Carnamet Press, 2000
Buku Teks
Ewing, Ethel E., author
Rand McNally & Company, 1962
Buku Teks
Evans, Jessie Campbell, author
D.C. Heath, 1942
Buku Teks
Sansom, George Bailey, Sir, 1883-1965, author
Institute of Pacific Relation, 1951
Buku Teks
Golden Press, 1966
Buku Referensi