Bonner, Frances
Sage Publications , 2003
Buku Teks
Schiffman, Harold F.
Routledge, 1996
Buku Teks
Sandler, Wendy
Cambridge University Press, 2006
Buku Teks
edited by Ralph Ludwig, Peter Mühlhäusler and Steve Pagel
Cambridge University Press, 2019
Buku Teks
Moulton, William G.
Modern Language Association of America, 1966
Buku Teks SO