Nourse, Alan E.
The body
Time Incorporated, 1964
 Buku Referensi
Portrait of the USA
1997
 Buku Teks SO
Headquarters USA
Omnigraphics, 2003
 Buku Teks
Malmstrom, Jean
Dialects USA
National Council of Teachers of English, 1963
 Buku Teks SO
Malmstrom, Jean
Dialects USA
National Council of Teachers of English , 1963
 Buku Teks SO