Παραπομπή σε μορφή APA (7η εκδ.)

Kalk, E. (1969). Regional planning and regional government in Europe: Report of a symposium held in April 1969 in Prague, Chechoslovakia. International Union of Local Authorities.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Kalk, E. Regional Planning and Regional Government in Europe: Report of a Symposium Held in April 1969 in Prague, Chechoslovakia. The Hague: International Union of Local Authorities, 1969.

Παραπομπή σε μορφή MLA (8th εκδ.)

Kalk, E. Regional Planning and Regional Government in Europe: Report of a Symposium Held in April 1969 in Prague, Chechoslovakia. International Union of Local Authorities, 1969.