Dyfyniad APA

Center, A. H., & Jackson, P. (1990). Public relations practices: Managerial case studies and problems (4th ed.). Prentice-Hall.

Dyfyniad Arddull Chicago

Center, Allen H., and Patrick Jackson. Public Relations Practices: Managerial Case Studies and Problems. 4th ed. Englewood Cliffs, N.J: Prentice-Hall, 1990.

Dyfyniad MLA

Center, Allen H., and Patrick Jackson. Public Relations Practices: Managerial Case Studies and Problems. 4th ed. Prentice-Hall, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.