Attwood, Gaynor, author
McGraw-Hill, 1989
Buku Referensi
Reynolds, George Walter, 1944-, author
Cengage Learning, 2019
Buku Teks
American Library Association,
Majalah, Jurnal, Buletin
Gunton, Tony, author
Penguin Books, 1993
Buku Referensi
Earl, Michael J., author
Prentice-Hall, 1989
Buku Teks