Artikel Jurnal
edited by Douglas A. Grouws
Macmillan Library Reference, 1992
Buku Referensi
Brown, James Dean, editor; Coombe, Christine A. (Christine Anne), 1962-, editor
Cambridge University Press, 2015
Buku Teks
editor, James P. Shaver
Macmillan, 1991
Buku Referensi
Norton, Lin S., author
Routledge, 2009
Buku Teks