http://en.wikipedia.org/wiki/Bipolar_junction_transistor
http://www.phas.ubc.ca/~quantmat/ARPES/PEOPLE/Andrea/Teaching/PHYS309/lecture10.pdf
http://mavdisk.mnsu.edu/alleng/electronics/chapters/5%20%20BJT%20AC%20Analysis.pdf
http://highered.mcgraw-hill.com/sites/dl/free/0072962984/310525/riz62984_ch10_bw.pdf
http://en.wikipedia.org/wiki/JFET
http://aries.ucsd.edu/najmabadi/CLASS/ECE60L/02-S/NOTES/FET.pdf