Basch, Lester D.
Sterling Publishing , 1962
Buku Teks
Furness, Edna L.
Appleton Century , 1964
Buku Teks
Carney, Edward
Routledge,, 1997
Buku Teks
Mudd, Norma
Hodder & Stoughton Educational , 1998
Buku Teks
Niles Christensen [and others]
Illinois Scott, Foresman , 1984
Buku Teks