Westerman, Frank
Atlas, 2007
Buku Teks
Wells, Herbert George
Secker & Warburg, 1940
Buku Teks
Martin, David, author
Thomas Nelson (Australia), 1972
Buku Teks
Rhodes, Winston, author
Twayne Publishers, 1969
Buku Teks
Westerman, John
Bumi Aksara, 1989
Buku Teks