Cambridge University Press, 2005
Buku Referensi
Sutanto Atmosumarto
Atma Stanton, 2004
Buku Referensi
Hornby, Albert Sydney
Oxford University Press , 1963
Buku Teks
Hornby, Albert Sydney
Oxford University Press, 1973
Buku Referensi
Hornby, Albert Sydney
Oxford University Press, 1954
Buku Referensi