Rogers, Everett M., author
The Free Press, 1973
Buku Teks
Majalah, Jurnal, Buletin
edited by Nancy Loudon
Churchill Livingstone, 1991
Buku Referensi
Wiley-Balckwell,
Majalah, Jurnal, Buletin
edited by James F. Phillips, John A. Ross
Clarendon Press, 1992
Buku Teks