Παραπομπή σε μορφή APA (7η εκδ.)

Mol, A. P. J., Lauber, V., & Liefferink, D. (2004). The voluntary approach to environmental policy: Joint environmental policy-making in Europe. Oxford University Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Mol, A. P. J., Volkmar Lauber, και Duncan Liefferink. The Voluntary Approach to Environmental Policy: Joint Environmental Policy-making in Europe. Oxford; New York: Oxford University Press, 2004.

Παραπομπή σε μορφή MLA (9th εκδ.)

Mol, A. P. J., et al. The Voluntary Approach to Environmental Policy: Joint Environmental Policy-making in Europe. Oxford University Press, 2004.