Liu, Jia
The Evaluation of worldwide digital reference services in libraries
Chandos Publishing, 2007
Buku Teks
Going where the users are: live digital reference
Artikel Jurnal
Service perspectives for the digital library remote reference services
Artikel Jurnal
Lankes, R. David
Implementing digital reference services : setting standards and making it real
Facet Publishing, 2003
Buku Teks
Digital creative and information communication technology industries : reference book
Infomedia, 2012
Buku Referensi