Mouly, George J.
American Book, 1963
Buku Teks
Bell, Judith
Open University Press, 1993
Buku Teks
Wiersma, William
Allyn and Bacon , 1991
Buku Teks
Borg, Walter R.
David Mc Kay Co., 1963
Buku Teks
Wiersma, William
Pearson/Allyn and Bacon, 2005
Buku Teks