Blair, Walter, author
Scott, Foresman and Company, 1948
Buku Teks
Yopp, Ruth Helen, author
Allyn and Bacon, 1992
Buku Teks
Ryu, Je-hun, author
Hollym, 2000
Buku Teks
Folse, Keith S.
Binarupa Aksara Press , 1993
Buku Teks
Collie, Joanne, author
Cambridge University Press, 1990
Buku Teks