Equinox, 2007
Buku Teks
Henshaw, Marjorie, author
Little, Brown, 1962
Buku Teks
Haarman, Louann, author
Oxford University Press, 1989
Buku Teks
edited by Wang Yuanhua, Chen Zishan
Dolphin Books, 2010
Buku Teks
Rubin Dorothy
CBS College pblishing, 1982
Buku Teks