"...Moreover, the scales of distance used on all portolanos were unrelated to any units of measurement used in the Mediterranean except in Catalonia. The Catalan units were believed to have been inherited from the Carthaginians; and since ..."John Ivimy. The Sphinx & the megaliths. Harper & Row, 1975. ISBN 978-0-06-012152-5 [Consulta: 13 setembre 2012].
"...41 Nordensk., op. cit., p.l9, 42 Nordensk. called this length-measure the "portolan-mile" which corresponds to 3.15 stadia or 5,830 meters. 4^ "'Skelton stated that it is called the Pisane after the place where it was found.."Leslie Ching-yee Li. Evolution of the Far East on Portuguese portolan charts, 1500-1650. University of Wisconsin--Madison. Libraries, 1974 [Consulta: 23 setembre 2012].
