Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (8th εκδ.)

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