Campbell, C. (2013). Campbell, Colin, Collection. DigitalGeorgetown.
Dyfyniad Arddull ChicagoCampbell, Colin. Campbell, Colin, Collection. Washington, D.C.: DigitalGeorgetown, 2013.
Dyfyniad MLACampbell, Colin. Campbell, Colin, Collection. DigitalGeorgetown, 2013.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.