http://mobileesl.blogspot.fi/2011/08/qr-codes-in-esl-classroom.html

https://en.islcollective.com/resources/search_result?Tags=QR%20code&searchworksheet=GO&type=Printables

https://oupeltglobalblog.com/2012/12/18/qr-codes-using-mobiles-in-the-efl-classroom/

https://www.slideshare.net/aikitristan/enriching-the-esl-classroom-with-qr-codes-41538763

http://www.catesolnews.org/2014/03/qr-code-grammar-activity/

http://www.emergingedtech.com/2014/12/25-ways-to-use-qr-codes-for-teaching-learning/

http://www.emoderationskills.com/?p=278&

http://www.scoop.it/t/the-best-of-qrcode/p/388514500/2011/08/20/qr-code-scavenger-hunt-with-esl-students

http://www.showme.com/blog/2013/11/a-qr-code-grammar-activity-for-the-esl-classroom/

http://www.zdnet.com/article/50-qr-code-resources-for-the-classroom/