Bibliography

1. http://www.wikihow.com/Add-a-Check-Mark-to-a-Word-Document
2. https://scratch.mit.edu/projects/48801632/
3. https://scratch.mit.edu/projects/1968139/
4. https://scratch.mit.edu/
5. http://nivedyavijaydesigncalss9bb.blogspot.ae/2015/10/design-situation.html
6. http://scratched.gse.harvard.edu/