Echols, John M.
Gramedia, 1990
Buku Referensi
Echols, John M.
Gramedia Pustaka Utama, 2003
Buku Referensi
Peter Salim
Modern English Press, 1989
Buku Referensi
Peter Salim
Modern English Press, 1993
Buku Referensi
Peter Salim
Modern English Press, 1986
Buku Referensi