——————Felleisen, Findler, Flatt, and Krishnaurthi, How to Design Programs, 2001''<ref name="Felleisen HtDP 2001">{{harvnb|Felleisen|Findler|Flatt|Krishnamurthi|2001|loc= [http://www.htdp.org/2003-09-26/Book/curriculum-Z-H-31.html art V "Generative Recursion]}}
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——————Felleisen, Findler, Flatt, and Krishnaurthi, How to Design Programs, 2001''<ref name="Felleisen HtDP 2001">{{harvnb|Felleisen|Findler|Flatt|Krishnamurthi|2001|loc= [http://www.htdp.org/2003-09-26/Book/curriculum-Z-H-31.html art V "Generative Recursion]