Memcachedb: The Complete Guide by Roberto Zicari · Published January 1, 2008 · Updated February 16, 2014 Steve Chu DOWNLOAD (PDF)
Apache Cassandra Documentation (DOWNLOAD .PDF 141 pages) February 16, 2012 by Roberto Zicari · Published February 16, 2012 · Last modified February 16, 2014
CouchDB Tutorial January 1, 2009 by Roberto Zicari · Published January 1, 2009 · Last modified February 16, 2014