Global Positioning System : Challenges in Sustaining and Upgrading Capabilities Persist.

MLA

United States. Global Positioning System : Challenges in Sustaining and Upgrading Capabilities Persist. [Place of publication not identified] : [publisher not identified], 2010.

APA

United States. (2010). Global Positioning System : Challenges in Sustaining and Upgrading Capabilities Persist. [Place of publication not identified] : [publisher not identified].

Chicago

United States. Global Positioning System : Challenges in Sustaining and Upgrading Capabilities Persist. [Place of publication not identified] : [publisher not identified], 2010.