There are some terrific books here, including old standards like the New Bible Commentary, which contains concise commentaries by some of the best evangelical scholars of the past century, the New Bible Dictionary, and the 4 volume New Testament Dictionary. But the volumes I find most useful are the innovative Dictionary of Biblical Imagery, the New Dictionary of Biblical Theology and the New Dictionary of Theology.
There are 18 volumes in the set. I could not have justified buying them separately, but in this format they are easily accessible, and less than 10% of what you would have paid in print form.
Referencing the information has been made easy: when you copy an extract, a footnote is added automatically with full bibliographical details of the book from which it has been extracted.
Highly recommended. Buy it, and you have a terrific Christian library at your fingertips.