==Sources==* "Byzantine Siege Warfare in Theory and Practice" by Eric McGeer from "The Medieval City under Siege"* "Logos Nouthetetikos, or Oration of Admonition to an Emperor" by William North
* «Byzantine Siege Warfare in Theory and Practice» by Eric McGeer from "The Medieval City under Siege"* "Logos Nouthetetikos, or Oration of Admonition to an Emperor" by William North