One way to find scholarly monographs or collections of essays about philosophy is to go to the shelf in the relevant area of the library where the author's works are located. Because our library is organized by subject according to Library of Congress Classification, you may find related materials in other areas (literature, law, etc.). Most materials having to do with Philosophy are class B, and they are located on the 1st floor of Cabell. Here's the general outline of B:
B Philosophy (General)
BD Speculative philosophy
BL Religions. Mythology. Rationalism
BP Islam. Bahaism. Theosophy, etc.
BS The Bible
BT Doctrinal Theology
BV Practical Theology
BX Christian Denominations
These print and online works may be useful in seeking out definitions or introductory historical material about philosophy.
E-books can be found via the VCU Libraries Search. Here are a couple resources that may be of particular use.
Google Books provides full-text access to many books in the public domain or out of copyright, and partial access to others.