• http://www.geocities.com/SiliconValley/Campus/1519/index.html
• http://www.foo.be/docs/tpj/issues/vol3_1/tpj0301-0007.html
• http://life.csu.edu.au/complex/tutorials/tutorial2.html
• http://hjem.get2net.dk/bnielsen/lsystems.html
• http://www.cpsc.ucalgary.ca/projects/bmv/java/LSystems/LSys.html
• http://shakti.trincoll.edu/~cschneid/lsystems.html
• http://shakti.trincoll.edu/~bhorling/lsystems/
• http://www.the-labs.com/Perl/ThePerlJournal/Issue_09_GD_L-systems/