توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Penjerdel (Corporation). (1961). Historical development of local government in the Penjerdel region. Pennsylvania Economy League (Eastern Division).

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Penjerdel (Corporation). Historical Development of Local Government in the Penjerdel Region. Philadelphia?: Pennsylvania Economy League (Eastern Division), 1961.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Penjerdel (Corporation). Historical Development of Local Government in the Penjerdel Region. Pennsylvania Economy League (Eastern Division), 1961.