Lundberg, Mattias. ”Pehr Frigel’s Om Contrapunkten (c. 1815): The Earliest Extant Counterpoint Method in the Swedish Vernacular, Edited and Translated With Historico-Critical Commentary”. Svensk Tidskrift för Musikforskning Swedish Journal of Music Research, vol. 15, december 2012, doi:10.58698/stm-sjm.v15.48514.