Gaya APA

International Association of Hydrogeologist: Hydrogeological Maps A Guide and A Standard Legend. (2003). Eise: Verlag Heinz Heise GmbH, Co KG.

Gaya MLA

International Association of Hydrogeologist: Hydrogeological Maps A Guide and A Standard Legend. 1. Eise: Verlag Heinz Heise GmbH, Co KG, 2003. Text.