Moss, G L, Graham, P, Sandige, R.S., Hinton, H.S. Logic Elements The Electrical Engineering Handbook Ed. Richard C. Dorf Boca raton crc Press llc. 2000Moss, G.L., Graham, P., Sandige, R.S., Hinton, H.S. “Logic Elements” The Electrical Engineering Handbook Ed. Richard C. Dorf Boca Raton: CRC Press LLC, 2000