References

Briggs, J, R. (2013): Python For Kids. San Francisco, CA: No Starch Press

Matthes, E. (2016): Python Crash Course. San Francisco, CA: No Starch Press

Payne, B. (2015): Teach Your Kids to Code. No Starch Press

Programiz. (n.d.). Python Program to Check Leap Year. Retrieved December 10, 2019, from https://www.programiz.com/python-programming/examples/leap-year.

Stephenson, B. (2014): The Python Workbook. Springer International Publishing