1. CMM metrology [Web] On http://www.cmmmetrology.co.uk/history_of_the_cmm.htm. Visited on 28 Dec 2011
2. Renishaw [Web] on http://www.renishaw.com/en/Our+company–6432. Visited on 28 Dec 2011
3. AFNOR [Web] on http://www.bivi.metrologie.afnor.org/ofm/metrologie/ii/ii-80/ii-80-30. Visited on 28 Dec 2011 (in French)
4. Mayer Roy (1999) Scientific Canadian: invention and innovation from Canada’s National Research Council. Raincoast Books, Vancouver. ISBN 978-1-5519-2266-9
5. Karara HM (1989) Non-topographic photogrammetry. American Society for Photogrammetry and Remote Sensing, USA