Sickle, C.E. van, author
Houghton Mifflin, 1947
Buku Teks
edited by Mark Golden and Peter Toohey
Routledge, 1997
Buku Teks
Beck, Roger, author
Blackwell Publishing, 2007
Buku Teks
Storey, Ian Christopher, 1946-, author
Wiley Balckwell, 2014
Buku Teks
Larue, Gerald A.
Prentice-Hall, 1975
Buku Teks