Tibbetts, A.M.
Scott, Foresman and Company, 1979
Buku Teks
Brown, Bruce
Dickenson, 1969
Buku Teks
Smith, Lewis Worthington
Follett Publishing Company, 1930
Buku Teks
Strunk, William
Macmillan, 1959
Buku Teks
Greenberg, Florence Bonzer, author
The Bobbs-Merrill, 1967
Buku Teks