https://people.cs.clemson.edu/~yfeaste/855Assignments/presentations/Team6-Combinational Logic Circuit.pdf

http://www.eng.auburn.edu/~strouce/class/elec2200/elec2200-8.pdf

http://www.ee.surrey.ac.uk/Projects/CAL/digital-logic/combindex.html

http://web.ee.nchu.edu.tw/~cpfan/FY92b-digital/Chapter4.pdf

http://www2.nau.edu/~sh295/EE110/PracticeProbs208sols.pdf

http://www.dauniv.ac.in/downloads/Digitalsystems_PPTs/DigDesignCh09L1.pdf

http://web.ist.utl.pt/luis.tarrataca/classes/computer_architecture/Chapter11-DigitalLogic.pdf

http://www.philadelphia.edu.jo/academics/hhardan/uploads/chapter 7- Combinational Logic Circuit with MSI and LSI.pdf

https://ece.uwaterloo.ca/~msachdev/ECE223/comb.pdf

http://www.eng.ucy.ac.cy/ece210/lecture_notes/lcdf3_chap_04.pdf

http://www.srmuniv.ac.in/ramapuram/sites/ramapuram/files/part1.pdf

http://ebooks.bharathuniv.ac.in/gdlc1/gdlc4/Electronics/Logic and Computer Design Fundamentals - Morris Mano.ppt