edited by Norman MacKenzie
The New American Library, 1968
Buku Teks
Carl M. White and associates: William W. Brickman ... [and others]
American Library Assoiation, 1973
Buku Referensi
Hart, Chris, author
Sage, 2003
Buku Teks
Pratt Vernon
Methuen Press, 1978
Buku Teks SO
edited by the London office of Hosein University
Hosei University , 1996
Buku Teks SO