Delogou, Paolo. "Rome in the ninth century: the economic system".
Volume 1 The Heirs of the Roman West, edited by Joachim Henning, Berlin, New York: De Gruyter, 2009, pp. 105-122.
https://doi.org/10.1515/9783110218848.1.105
Delogou, Paolo. "Rome in the ninth century: the economic system" In
Volume 1 The Heirs of the Roman West edited by Joachim Henning, 105-122. Berlin, New York: De Gruyter, 2009.
https://doi.org/10.1515/9783110218848.1.105