Sources

http://bertram-31-flybridge-cruiser.yacht-spotting.com

http://en.wikipedia.org/wiki/Richard_Bertram

http://www.bertram.com/

http://www.thehulltruth.com/boating-outdoor-photos/142242-bertram-laughs-big-water.html

http://www.yachtforums.com/threads/catastrophic-delamination-on-a-new-bertram-63.10591/

http://www.yachtsurvey.com/index.html

http://www.yachtsinternational.com/lifestyle/lifestyle-people/it-all-began-with-richard-bertram/

http://bertram-28-flybridge-cruiser.yacht-spotting.com/

http://bertram-31-flybridge-cruiser.yacht-spotting.com/

http://carinteriordesign.net/

http://www.boatinternational.com/yachts/news/new-ownership-for-bertram-yachts--22827

http://www.tradeonlytoday.com/2015/02/miami-2015-owner-charts-bertram-yachts/

http://www.huntdesigns.com/deepv.htm

http://www.yachtsurvey.com/boatreviews/bertram_33_sf.htm