Celtic Guitar: Article on the use of guitar and bouzouki/cittern in Celtic music, by Cliff McGann (originally published in Celtic Heritage); includes notes on significant performers.
Cittern: A Yahoo! group to discuss citterns, bouzoukis and related instruments; covers the instruments, makers, and playing techniques.
Cittern and Mandolin: Pictures and descriptions, links, Celtic music session venues in Southern California, video and audio of performer Andy Irvine.
Citterns: A fact sheet on the modern instrument, a hybrid development of older instruments and the mandolin family, and strongly associated with Celtic music. Includes information on tuning, stringing, and playing, with a listing of resources.
Citterns 'n Stuff: An enthusiast for citterns, bouzoukis, other mandolin-like instruments, and their music; maintains a database of categorised links.
Han's Irish Bouzouki Homepage.: Resource for learners and players. Includes information on tuning, tablature, pictures, recommended books and listening.
How to Tell Mandolins, Citterns, Mandolas, Bouzoukis, etc. Apart: Describes the differences in construction and tuning in this group of instruments.
Irish Bouzouki: Information on the instrument and well known players. Includes a gallery and audio clips.
Irish Bouzouki: An article on the instrument in Irish music; includes tunings, tabs, practical tips, and links.
Kennaquhair Stringed Instruments: Luthier specializing in cittern, bouzouki, and other mandolin family instruments; also make acoustic guitars. Includes information on instruments, items in stock and pricing.
So Just What Exactly Is A Cittern, Anyway?: Article exploring the misleading and unhistorical nomenclature of the "octave mandolin-mandola-cittern-Irish bouzouki" family of hybrid instruments.
Some thoughts on the Irish Bouzouki: Article originally published in American Lutherie No 54, describing the four-course bouzouki, and five-course cittern, and techniques for their construction.