https://www.etsy.com/listing/161448181/amigurumi-christmas-combo-christmas-tree
http://annemarieshaakblog.blogspot.com/2011/12/monday-pattern-day-christmas-tree.html
http://www.craftpassion.com/2009/12/crochet-pattern-christmas-tree-ornaments.html
https://www.etsy.com/listing/207956891/christmas-tree-decoration-crochet
http://www.petalstopicots.com/2013/12/cone-christmas-tree-crochet-patterns/
http://leartidiminerva.blogspot.it/2014/09/albero-di-natale-alluncinetto-crochet.html
http://www.thelazyhobbyhopper.blogspot.in/2014/10/crochet-christmas-tree-free-pattern.html
http://www.ravelry.com/patterns/library/christmas-tree-crochet-ornament