West, Rebecca
The Viking press, 1936
Buku Teks
Reed, Bill
Hyland House, 1984
Buku Teks
Lembaga Penelitian Universitas Indonesia, 2007
Artikel Jurnal
Moyer, Reed
John Wiley & Sons, 1984
Buku Teks
Anderson, Reed
London Macmillan Education 1991,
Buku Teks