Gaya APA

Putt, A, D., Springer, J, F. (1889). Policy Research : Cocepts, Methods, and Aplications . New jersey: Prentice Hall.

Gaya MLA

Putt, Allen, D.., Springer, J., Fred. "Policy Research : Cocepts, Methods, and Aplications". New jersey: Prentice Hall, 1889. Text.