Gaya APA
Bopp, Richard E.. (2000).
Reference and information services : an introduction .
Amerika:
Libraries Unlimited.
Gaya Chicago
Bopp, Richard E..
Reference and information services : an introduction.
Amerika:
Libraries Unlimited,
2000.
Buku.
Gaya MLA
Bopp, Richard E..
Reference and information services : an introduction.
Amerika:
Libraries Unlimited,
2000.
Buku.
Gaya Turabian
Bopp, Richard E..
Reference and information services : an introduction.
Amerika:
Libraries Unlimited,
2000.
Buku.