Volker H. Schendel – Vitamin D Research - Freier Wissenschaftsjournalist - http://www.urlaub.astrologiedhs.de/3.html

http://www.acbl.org/assets/documents/teachers/Teacher-Manuals/Bidding-in-the-21st-Century-Lesson-8.pdf

http://www.bridgeguys.com/doubles/ResponsiveDouble.html

http://www.bridgeguys.com/doubles/RespondToTakeoutDouble.html

http://www.bridgeguys.com/doubles/TakeoutDouble.html

http://www.bridgeguys.com/doubles/RespondToTakeoutDouble.html

http://web2.acbl.org/documentLibrary/play/Commonly_Used_Conventions/takeoutdouble.pdf

http://www.bridgebum.com/takeout_double.php

http://www.jazclass.aust.com/bridge/br14.htm

http://web.mit.edu/mitdlbc/www/novice-results/pdf-files/negdbl.pdf

http://www.betterbridge.com/misc/StandardArticles/Standard200711.pdf

http://www.bridgehands.com/T/Takeout_Double.htm

http://www.mrbridge.co.uk/library/Take-out_Doubles.pdf

http://www.math.cornell.edu/~belk/takeout.htm

http://bridge.wikia.com/wiki/Takeout_double

http://www.netplaces.com/bridge/competitive-bidding-part-2/responding-to-a-takeout-double.htm

http://www.gabrial-ui.com/about_bridge/conventions/TAKEOUTD.HTM

http://www.ehow.com/how_2225711_use-takeout-double-bridge-lesson-9.html

http://www.larryco.com/BridgeArticles/ArticleDetails.aspx?articleID=186

http://www.7ntbyme.com/75/negative-double-vs-takeout-double-no-more-confusion/

http://www.rpbridge.net/3h00.htm

http://home.comcast.net/~kwbridge/comp.htm

http://www.fifthchair.org/pdfs/Takeout%20Double.pdf

http://richmondbridge.net/PDF/handouts/takeoutdouble.pdf

http://www.bridge7.com/xbric6.aspx

http://www.newwestbridge.ca/Answers%20to%20Quiz%20on%20Take%20out%20Double%20.htm

http://www.chiark.greenend.org.uk/~ryounger/bridge/takeout_double.html

http://www.betterbridge.com/misc/StandardArticles/Standard200801.pdf

http://www.ebu.co.uk/publications/Education%20and%20Teaching/Sandra%20Landy%20Articles/apr03.pdf

http://www.gravesendbridgeclub.org/CB/overcalls/TakeoutDoubles.html