Carl M. White and associates: William W. Brickman ... [and others]
American Library Assoiation, 1973
Buku Referensi
Hart, Chris
Sage, 2003
Buku Teks
edited by the London office of Hosein University
Hosei University , 1996
Buku Teks SO
Pratt Vernon
Methuen Press, 1978
Buku Teks
Harcourt, Brace & World, 1970
Buku Teks