I would highly recommend Eric Evans' Domain Driven Design as the second Object Oriented book to be read. Most any primer on OO will give you the foundation of

I would highly recommend Eric Evans' Domain Driven Design as the second Object Oriented book to be read. Most any primer on OO will give you the foundation of ideas but Erick's book makes the knowledge useful and has been repeatedly called OO done right. ISBN-13: 978-0321125217 ISBN-10: 0321125215