Trudgill, Peter
Penguin Books, 1995
Buku Teks SO
disunting oleh Djoko Kentjono
Fakultas sastra UI, 1984
Buku Teks SO
Carter, Ronald
Routledge, 2004
Buku Teks SO
Murray, Neil
Cambridge University Press, 2015
eBooks
edited by M. Dale Kinkade, Kenneth L. Hale and Oswald Werner
Peter De Ridder Press, 1975
Buku Teks SO