Bibliographical sources mentioned in these texts:
Boekel, Peter is mentioned in the cartouche of Holsatiĉ as its maker, Ort89a
Cran(t)zius, Albert is mentioned on map sheet Ort89B; further in map texts:
: Chronicle of Saxony 89.7, 89.10, 89.15
Edling, Peter, from Colberg 89.15
Helmond 89.15
Irenĉus, Franciscus 89.13
Roy, Samuel : Treatise on the Danes and Dietmarshers 89.7
Saxo 89.15
Strabo 89.2