“NPS.gov Homepage (U.S. National Park Service).” National Parks Service, U.S. Department of the Interior, www.nps.gov/index.htm.

​

“Pennsylvania.” Govtrack. Govtrack 2004, 2011, www.govtrack.us/congress/members/PA.

 

Somervill, Barbara A. Pennsylvania. Children's Press, A Division of Scholastic Inc., 2015.

​

“Unwrap Your Chocolate Adventure.” HERSHEY'S CHOCOLATE WORLD, www.hersheys.com/chocolateworld/en_us/home.html.

 

WBO Student, www.worldbookonline.com/student-new/#/article/home/ar421420/pennsylvania.