Παραπομπή APA

Barney Warf. (2010). Encyclopedia of geography (v.6). Sage.

Παραπομπή Chicago Style

Barney Warf. Encyclopedia of Geography (v.6). New Delhi: Sage, 2010.

Παραπομπή MLA

Barney Warf. Encyclopedia of Geography (v.6). Sage, 2010.