Root, D., & Irwin, J. (2000). Pennsylvania (First edition.). Fodor''s Travel Publications.
Lua i Stíl Chicago (17ú heag.)Root, Douglas, agus Jerry Irwin. Pennsylvania. First edition. Oakland: Fodor''s Travel Publications, 2000.
Lua MLA (9ú heag.)Root, Douglas, agus Jerry Irwin. Pennsylvania. First edition. Fodor''s Travel Publications, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.