Hartmann, Reinhard R.K., author
Routledge, 1998
Buku Referensi
Hartmann, Reinhard R.K., author
Routledge, 1998
Buku Referensi
Hartmann, Reinhard R.K., author
Routledge , 1998
Buku Referensi
Svensen, Bo, author
Cambridge University Press, 2009
Buku Teks
edited by Raven I. Mcdavid and Audrey R. Duckert
Foresman and Company,
Buku Teks