“Digital Reference.” Lankes, R. David (2003). In Miriam Drake (Ed.), Encyclopedia of Library and Information Science (2nd Edition). New York: Marcel Dekker, Inc.
http://quartz.syr.edu/rdlankes/Publications/Others/Encyclo-DigRef.pdf
“Digital Reference.” Lankes, R. David (2003). In Miriam Drake (Ed.), Encyclopedia of Library and Information Science (2nd Edition). New York: Marcel Dekker, Inc.
http://quartz.syr.edu/rdlankes/Publications/Others/Encyclo-DigRef.pdf