Library Association Publishing, 1989
Buku Referensi
Artikel Jurnal
Rose, Ernestine, author
Columbia University Press, 1954
Buku Teks
Cohen, Nathan Edward, author
Holt, Rinehart and Winston, 1958
Buku Teks
Totterdell, Anne, author
Library Association Publishing, 2000
Buku Teks