Artificial Intelligence by Rich and Knight covers this topic well.
Knowledge Representation: An AI perspective by H. Reichgelt, Ablex, New York covers all aspects of this topic with good examples.
The Handbook of Artificial Intelligence (Vol. 1, Ch 3) provides a good concise treatment of this area. Volume 3 Chapter 11 also gives good background information on Quinlan's semantic memory system. The HAM, ACT and MEMOD systems are also dealt with.
Artificial Intelligence Programming by Charniak et al. gives Example LISP code for constructing Semantic nets and forms.
See also the Expert Systems course.