APA (7th ed.) Citation

Letham. (2003). GPS made easy: Using Global Positioning Systems in the outdoors (4th ed., WAAS rev.). Mountaineers Books.

Chicago Style (17th ed.) Citation

Letham. GPS Made Easy: Using Global Positioning Systems in the Outdoors. 4th ed., WAAS rev. Seattle, WA: Mountaineers Books, 2003.

MLA (8th ed.) Citation

Letham. GPS Made Easy: Using Global Positioning Systems in the Outdoors. 4th ed., WAAS rev. Mountaineers Books, 2003.