Dean Curry, genaral series editor
English Language Programs Division, 1988
Buku Referensi
Watt, Homer A., author
Scott, Foresman, 1932
Buku Teks
Watt, Homer A., author
Scott, Foresman, 1932
Buku Teks
edited by Benjamin B. Hoover, Donald S. Taylor
Holt, 1957
Buku Teks
Watt, Homer A., author
Scott, Foresman and company , 1925
Buku Teks