Bengtsson, Ann McDonagh, author
Gower, 1992
Buku Teks
Adler, Ronald B. (Ronald Brian), 1946-, author
McGraw-Hill, 2002
Multimedia
Faith, Nicholas, author
Hamish Hamilton, 1971
Buku Teks
New York, N.Y. , Prentice Hall 1994
Buku Teks
Agren, Maria, author
Oxford University Press, 2017
eBooks