APA (7th ed.) Citation

Ahlers, D. (2012). Geographically focused web information retrieval. Olwir Verl.

Chicago Style (17th ed.) Citation

Ahlers, Dirk. Geographically Focused Web Information Retrieval. Edewecht: Olwir Verl, 2012.

MLA (9th ed.) Citation

Ahlers, Dirk. Geographically Focused Web Information Retrieval. Olwir Verl, 2012.

Warning: These citations may not always be 100% accurate.