Bibliographical sources:
Bouillus, Carolus 70.2, 70.8
Brontius, Nicolaus 70.3
Cæsar Commentaries 70.7
Cnalis, Robert 70.5
Guicciardine 70.5, 70.10
Hubert Thomas of Liege 70.7, De Tungris & Eburonibus 70.10
Lessabæus, Iacobus 70.2, 70.10
Ptolemæus 70.7
Surhonius, Jacobus is mentioned in the cartouche of the second Hannonia map as its maker, Ort70