APA (7th ed.) Citation

(2015). S. 2257, the National Park Service Centennial Act. ProQuest.

Chicago Style (17th ed.) Citation

S. 2257, the National Park Service Centennial Act. Bethesda, Md.: ProQuest, 2015.

MLA (9th ed.) Citation

S. 2257, the National Park Service Centennial Act. ProQuest, 2015.

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