Hazen, Kirk
Massachusetts : Wiley Blackwell, 2015
Buku Teks
Fromkin, Victoria A.
Holt, Rinehart and Winston, 1981
Buku Teks
Montgomery, Martin
Routledge, Taylor & Francis Group, 2008
Buku Teks
Ralph Fasold; Jeff Connor-Linton
Cambridge University Press , 2006
Buku Teks
Littlewood, William
Cambridge Uniiversity Press , 1983
Buku Teks