Butdisuwan, Sujin Basic issues in digital libraries: the 21st century knowledge centers / Sujin Butdisuwan - Hyderabad : Professional Books Publisher, 2013. - 311 pages : illustrations ; 23 cm. ISBN: 9788190972857 Subjects--Topical Terms: Digital librariesInformation storage and retrieval systems Dewey Class. No.: 025.002 / BUT