Van Hoeve, 1970
Buku Teks
Conason, Joe, author
Simon & Schuster, 2016
Buku Teks
John Benjamins Publishing, 1990
Buku Teks
edited by G.R. McKay and B.A. Sommer
Applied Linguistics Association of Australia, 1984
Buku Teks
Blackwell Publishing, 2004
Buku Teks