https://www.purplemath.com/modules/numbbase.htm

https://en.wikipedia.org/wiki/Binary_number

http://datagenetics.com/blog/november32014/

https://www.bottomupcs.com/chapter01.xhtml

https://www.geeksforgeeks.org/digital-logic-code-converters-bcd8421-tofrom-excess-3/

http://www.cs.ucf.edu/~dmarino/ucf/cot3100h/lectures/COT3100BitwiseOps.pdf

https://en.wikipedia.org/wiki/Parity_bit

http://ebooks.bharathuniv.ac.in/gdlc1/gdlc1/Engineering Merged Library v3.0/GDLC/Number Systems, Boolean Algebra and Logic Gates (7459)/Number Systems, Boolean Algebra and Logic Gates - GDLC.pdf

http://www.mee.tcd.ie/~ledoyle/TEACHING/12 - error2.pdf

https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-02-introduction-to-eecs-ii-digital-communication-systems-fall-2012/lecture-slides/MIT6_02F12_lec04.pdf

https://en.wikipedia.org/wiki/Hamming_code

https://orion.math.iastate.edu/linglong/Math690F04/HammingCodes.pdf

http://ce.aut.ac.ir/~houshmand/1-BinarySystems_1.pdf

http://avandweb.ir/staticpage/documents/Madar Manteghi/Madarhay Manteghi_ver 01 _ Part 01 _ Tel 09125773990_09371410986.ppt

http://maleki.semnan.ac.ir/uploads/maleki/Digital_docs/Digital_01.pdf

http://ce.sharif.edu/courses/91-92/1/ce212-1/assignments/files/assignDir/Digital Design HW 1.pdf

https://fa.wikipedia.org/wiki/روش‌های_کدگذاری_در_رایانه