Schiffrin, Deborah, author
Blackwell , 2000
Buku Teks
edited Philip Bean, Sewart MacPherson
Routledge and Kegan Paul, 1983
Buku Teks
Tame, Jeremy R. H., author
Springer Singapore, 2019
eBooks
Glassman, William E., author
Open University Press, 2004
Buku Teks
Shrodes, Caroline, author
Macmillan, 1967
Buku Teks