Παραπομπή σε μορφή APA (7η εκδ.)

Knoepfel, P. (2007). Environmental Policy Analyses: Learning from the Past for the Future - 25 Years of Research. Springer Berlin Heidelberg.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Knoepfel, Peter. Environmental Policy Analyses: Learning from the Past for the Future - 25 Years of Research. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007.

Παραπομπή σε μορφή MLA (8th εκδ.)

Knoepfel, Peter. Environmental Policy Analyses: Learning from the Past for the Future - 25 Years of Research. Springer Berlin Heidelberg, 2007.