Ur, Penny, author
Cambridge University Press, 1999
Buku Teks
Cook, Guy (Guy W. D.), author
Oxford University Press, 2000
Buku Teks
Christopher Alexander, Sara Ishikawa, Murray Silverstein, Max Jacobson, Ingrid Fiksdahl-King, Sholomo Angel
Oxford University Press, 1977
Buku Referensi
edited by Albert H. Marckwardt
National Council of Teachers of English, 1968
Buku Teks
Rivers, Wilga M., author
Cambridge University Press, 1994
Buku Teks