Kiesewetter, R. (1993). Philadelphia. Beeskow Kreiskalender.
Cita Chicago (17th ed.)Kiesewetter, Reinhard. "Philadelphia." Beeskow Kreiskalender 1993.
Cita MLA (8th ed.)Kiesewetter, Reinhard. "Philadelphia." Beeskow Kreiskalender, 1993.
Atenció: Aquestes cites poden no estar 100% correctes.