Παραπομπή σε μορφή APA (7η εκδ.)

Friedrich, C. J. (1950). Constitutional government and democracy: Theory and practice in Europe and America (Rev. ed.). Ginn and Company.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Friedrich, Carl J. Constitutional Government and Democracy: Theory and Practice in Europe and America. Rev. ed. Boston: Ginn and Company, 1950.

Παραπομπή σε μορφή MLA (9th εκδ.)

Friedrich, Carl J. Constitutional Government and Democracy: Theory and Practice in Europe and America. Rev. ed. Ginn and Company, 1950.