L., W., D. et al.(1995).Public relations : strategic and tactics / Dennis L. Wilcox, Philip H. Ault, Warren K. Agee (Ed.ke-4).New York:Harper Collins College Publishers.
Gaya MLA
Wilcox, Dennis, L.. et al."Public relations : strategic and tactics / Dennis L. Wilcox, Philip H. Ault, Warren K. Agee".Ed.ke-4New York:Harper Collins College Publishers,1995.Textbook.