Echols, John M., author
Gramedia, 1980
Buku Referensi
Peter Salim, author
Modern English Press , 1997
Buku Referensi
Peter Salim, author
Modern English Press, 1997
Buku Referensi
Sutanto Atmosumarto, author
Atma Stanton, 2004
Buku Referensi
Buku Teks