Παραπομπή σε μορφή APA (7η εκδ.)

Sandler, T. (1997). Global challenges: An approach to environmental, political and economics problems. Cambridge University Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Sandler, Todd. Global Challenges: An Approach to Environmental, Political and Economics Problems. Cambridge: Cambridge University Press, 1997.

Παραπομπή σε μορφή MLA (9th εκδ.)

Sandler, Todd. Global Challenges: An Approach to Environmental, Political and Economics Problems. Cambridge University Press, 1997.