Vancil, David L
Allyn and Bacon, 1993
Buku Teks
Rybacki, Karyn C. (Karyn Charles), 1947-, author
Pearson, 2014
Buku Teks
Foss, Sonja K., compiler
Waveland Press, 1985
Buku Teks
Sloane, Thomas O., author
Oxford University Press, 2001
Buku Referensi
Aarts, Bas, author
Palgrave Macmillan, 2008
Buku Teks