Cassell , 1994
Buku Teks
Henshaw, Marjorie, author
Little, Brown, 1962
Buku Teks
Blair, Walter, author
Scott Foresman, 1955
Buku Teks
Gardiner, Peter D.R., author
Charles Scribner's Sons, 1971
Buku Teks
Blair, Walter, author
Scott, Foresman and Company, 1949
Buku Teks