Παραπομπή APA

Vig, N. J., & Kraft, M. E. (2016). Environmental policy: New directions for the twenty-first century (Ninth edition.). Sage.

Παραπομπή Chicago Style

Vig, Norman J., και Michael E. Kraft. Environmental Policy: New Directions for the Twenty-first Century. Ninth edition. Los angeles: Sage, 2016.

Παραπομπή MLA

Vig, Norman J., και Michael E. Kraft. Environmental Policy: New Directions for the Twenty-first Century. Ninth edition. Sage, 2016.