Phillips, D.C., author
Stanford University Press, 1976
Buku Teks
Go, Julian, author
Oxford University Press, 2016
eBooks
Haarman, Louann, author
Oxford University Press, 1989
Buku Teks
by Thomas J. Sullivan ... [and others]
John Wiley & Sons, 1980
Buku Teks
Inderbitzin, Michelle Lee, author
SAGE, 2015
Buku Teks