APA (7th ed.) Citation

Lenggenhager, W. Northwest -- Petroglyphs and pictographs.

Chicago Style (17th ed.) Citation

Lenggenhager, Werner. Northwest -- Petroglyphs and Pictographs.

MLA (8th ed.) Citation

Lenggenhager, Werner. Northwest -- Petroglyphs and Pictographs.

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