Baerman, Matthew
Cambridge University Press, 2017
Buku Teks
edited by Mike Hinchey, Lorcan Coyle
Springer, 2012
eBooks
Savage, John E.
John Wiley & Sons, 1976
Buku Teks
Krebs, Charles J.
Harper Collins, 1989
Buku Teks
edited by Karen J. Warren ; with the assistance of Barbara Wells-Howe
Routledge, 1994
Buku Teks