Gaya APA
ULMER, R, R., HOLLOWS, J. (2011).
Effective Crisis Communication: Moving From Crisis to Opportunity .
Sage:
London.
Gaya MLA
ULMER, Robert, R.., HOLLOWS, Joanne.
"Effective Crisis Communication: Moving From Crisis to Opportunity".
Sage:
London,
2011.
Buku Teks.