Beck, Raymond W., author
Burgess, 1977
Buku Teks
Breneman, W.R., author
Xerox College Publishing, 1959
Buku Teks
Smith, Ella Thea, author
Harcourt, Brace & World, 1961
Buku Teks
McCourt, Richard M., author
McGraw-Hill, 1990
Buku Referensi
Lawson, Anton E., author
McGraw-Hill, 1995
Buku Teks