Main reference:
"Fundamentals of Database Systems", Ramez Elmasri, Shamkant B. Navathe, Addison Wesley, 4th Edition
"Database Systems - A Practical Approach to Design, Implementation and Management", Thomas Connaly, Carolyn Begg, Addison Wesley, 4th Edition
Other Reference:
"Database Management Systems", Raghu Ramakrishnan, Johannes Gehrke, 2nd Edition