Artikel Jurnal
Levinson, Stephen C.
Cambridge University Press, 1983
Buku Teks
Grundy, Peter F.
Edward Arnold, 1995
Buku Teks
Diem Ihsan
Universitas Sriwijaya, 2011
Buku Teks
Keith Allan and Kasia M. Jaszczolt, editors
Cambridge University Press, 2012
Buku Teks