Παραπομπή σε μορφή APA (7η εκδ.)

Blacksell, M., & Williams, A. M. (1994). The European challenge: Geography and development in the European community. Oxford University Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Blacksell, Mark, και Allan M. Williams. The European Challenge: Geography and Development in the European Community. Oxford [England]: Oxford University Press, 1994.

Παραπομπή σε μορφή MLA (8th εκδ.)

Blacksell, Mark, και Allan M. Williams. The European Challenge: Geography and Development in the European Community. Oxford University Press, 1994.