Adams, D., & Speicher, D. (1989). 25 bicycle tours in eastern Pennsylvania: Day trips and overnights from Philadelphia to the highlands (2nd rev. ed.). Woodstock, Vt.: Backcountry Publications.

Adams, Dale., and Dale Speicher. 25 Bicycle Tours in Eastern Pennsylvania: Day Trips and Overnights From Philadelphia to the Highlands. 2nd rev. ed. Woodstock, Vt.: Backcountry Publications, 1989.

Adams, Dale., and Dale Speicher. 25 Bicycle Tours in Eastern Pennsylvania: Day Trips and Overnights From Philadelphia to the Highlands. 2nd rev. ed. Woodstock, Vt.: Backcountry Publications, 1989.