Object Databases: The Essentials by Roberto Zicari · Published November 3, 2013 · Updated February 24, 2014 M. Loomis, Object Databases: The Essentials, Addison-Wesley, 1994, ISBN 0-201-56341-2
The Definitive Guide to MongoDB: The NoSQL Database for Cloud and Desktop Computing. November 3, 2013 by Roberto Zicari · Published November 3, 2013 · Last modified February 24, 2014
Q Tips: Fast, Scalable and Maintainable Kdb+ March 30, 2015 by Roberto Zicari · Published March 30, 2015