Artikel Jurnal
Weingand, Darlene E., author
[American Library association, ], 2001
eBooks
Snape, Robert, author
Library Association , 1995
Buku Teks
McColvin, Lionel R., author
UNESCO , 1986
Buku Teks
Jacobs, Jane, author
Random House , 1961
Buku Teks