Smith, Joan Macfarlance
Routledge & K. Paul, 1972
Buku Teks
Magnusson, Eva, author
Cambridge University Press, 2015
Buku Teks
Davis, Christine S., author
Routledge, Taylor & Francis Group, 2017
Buku Teks
Judd, Charles M., author
Methuen, 1991
Buku Teks
Sjoberg, Gideon
Harper & Row Publishers, 1968
Buku Teks