Multiplexer using Universal Gates.

1] Donald P Leach, Albert Paul Malvino, Gautam Saha, Digital Principles and Applications, Tata McGraw Hill Education Pvt.Ltd.

2] Ronald. J. Tocci, Neal. S. Widmer, Gregory L. Moss, Digital Systems Principles and Applications, 10th edition, Pearson Education.

3] https://soaneemrana.org/onewebmedia/DIGITAL%20PRINCIPLES%20AND%20APPLICATION%20BY%20LEACH%20&%20MALVINO.pdf

4] http://american.cs.ucdavis.edu/academic/ecs154a.sum14/postscript/cosc205.pdf