Sommerfeldt, J. R. (1970). The High Middle Ages, 814–1300. Edited by Archibald R. Lewis. Englewood Cliffs, New Jersey: Prentice-Hall, 1970. xiv + 174 pp. 4.95. Church history, 39(4), 544. doi:10.2307/3162935
Chicago-Zitierstil (17. Ausg.)Sommerfeldt, John R. "The High Middle Ages, 814–1300. Edited by Archibald R. Lewis. Englewood Cliffs, New Jersey: Prentice-Hall, 1970. Xiv + 174 Pp. 4.95." Church History 39, no. 4 (1970): 544, https://doi.org/10.2307/3162935.
MLA-Zitierstil (9. Ausg.)Sommerfeldt, John R. "The High Middle Ages, 814–1300. Edited by Archibald R. Lewis. Englewood Cliffs, New Jersey: Prentice-Hall, 1970. Xiv + 174 Pp. 4.95." Church History, vol. 39, no. 4, 1970, p. 544, https://doi.org/10.2307/3162935.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.
