Bibliographical sources mentioned in this text:
Cœnalis, Robert : Bk.2 De Re Gallica 21.17, 21.30
Cambrensis, Giraldus : Itinerary 21.8, 21.26
Leland, Iohn : Genethliacon 21.8, 21.26, 21.29
Lhoyd, Humfrey : mentioned as the maker of this map in cartouche Ort21; further in texts
21.2, 21.7, 21.22, 21.26; : De Mona Druidum 21.7
Monmouth, Geoffrey of (Galfridus Monumenthensis) 21.19, 21.32
Polydorus : History of England 21.9, 21.17, 21.27, 21.30
Ptolemæus is mentioned twice on the map itself
Sylvester Gyraldus : Itinerary of Wales 21.8, 21.26
Tacitus 21.7; : Annales Bk.14 verse 30 21.9, 21.28
Vergilius, Polydorus 21.9, 21.17, 21.27, 21.30
William of Newberry : Bk.2, ch.5 21.8, 21.17