Gaya APA

Ulmer, R, R., Sellnoe, T, L. (2015). effective crisis communication : Moving from crisis to opportunity (3 ed). Amerika: Sage Publications.

Gaya MLA

Ulmer, Robert, R., Sellnoe, Timothy, L. "effective crisis communication : Moving from crisis to opportunity". 3 ed Amerika: Sage Publications, 2015. Buku.