(1) Building Virtual Communities: Learning and Change in Cyberspace K. Ann Renninger; Wesley Shumar ISBN: 9780521785587 Cambridge University Press View at publisher
(2) Analog VLSI: Circuits and Principles by Shih-Chii Liu, Jörg Kramer, Giacomo Indiveri, Tobias Delbrück and Rodney Douglas ISBN: 9780262122559 MIT Press View at publisher