Παραπομπή σε μορφή APA (7η εκδ.)

Koppen, C. S. A. v., & Markham, W. T. (2007). Protecting nature: Organizations and networks in Europe and the USA. Edward Elgar.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Koppen, C. S. A. van, και William T. Markham. Protecting Nature: Organizations and Networks in Europe and the USA. Cheltenham, UK: Edward Elgar, 2007.

Παραπομπή σε μορφή MLA (9th εκδ.)

Koppen, C. S. A. van, και William T. Markham. Protecting Nature: Organizations and Networks in Europe and the USA. Edward Elgar, 2007.