Hartmann, Johan Peter Emilius (1805-1900) - Danish composer. Brief biography emphasizing his works in different styles and musical epochs with illustration from Dacapo Records. - http://www.dacapo-records.dk/?page=artist&id=1419&typemask=2
Johan Peter Emilius Hartmann (1805-1900) - Vocal works with Danish lyrics from the Lied and Art Song Texts Page at REC Music. - http://www.recmusic.org/lieder/h/hartmann.html
Hartmann, Johan Peter Emilius - Biography notes his connection with other composers in the family, credits his influence on Danish national opera, and lists major works. From the Grove Concise Dictionary of Music entry at WQXR radio. - http://www.wqxr.com/cgi-bin/iowa/cla/learning/grove.html?record=4088