article
article (electronic)
book
book (electronic)
book (large print)
electronic
journal
journal (electronic)
map
map (electronic)
microform
music-score
music-score (electronic)
newspaper
newspaper (electronic)
picture
picture (electronic)
recording
recording-cd
recording-cassette
recording-vinyl
thesis
thesis (electronic)
video
video-blu-ray
video-dvd
video-vhs
video (electronic)
web
web (electronic)
other