Herdan, Gustav
P. Noordhoff, 1956
Buku Teks
Dunphy, Dexter C., author
McGraw-Hill, 1985
Buku Teks
Beard, Adrian, author
Routledge, 2004
Buku Teks
Jones, Mari C, author
Routledge , 2006
Buku Teks
Aitchison, Jean, 1938-, author
Cambridge University Press, 1995
Buku Teks