Clouse, Barbara Fine, author
McGraw-Hill, 1999
Buku Teks
Conlin, Mary Lou
Houghton Miffiln, 1983
Buku Teks
Gillespie, Sheena, author
Scott, Foresman and Company, 1986
Buku Teks
Trimmer, Joseph F., author
Houghton Miffiln, 1981
Buku Teks
Muller, Gilbert H., author
McGraw-Hill, 1987
Buku Teks