Olrik, Hans (1906). Danmarks Lærerhøjskole, 1856-1906 [Denmark's Teacher School, 1856-1906] (in Danish). Gyldendalske Boghandel, Nordisk Forlag. p. 178.
Ahlborg, Per[in Esperanto] (March 1938). Hagerup, H. (ed.). "Necrologe" [Obituary]. Novialiste: Revue por li Cosmopoli Standard-Lingue (in Novial). No. 19. pp. 410–411. Retrieved 20 September 2023.
Wendel-Hansen, Jens Lei; Thøgersen, Mette Ladegaard (1 April 2021). "1850-1920 i Nyborg Kommune". Trap Danmark (in Danish). Retrieved 17 September 2023 – via lex.dk.
Triechel, Fritz (1974). "Forchhammer-Familie"(PDF). Biographisches Lexikon für Schleswig-Holstein und Lübeck. Vol. 3. pp. 844–847. Retrieved 16 September 2023.
Ahlborg, Per[in Esperanto] (March 1938). Hagerup, H. (ed.). "Necrologe" [Obituary]. Novialiste: Revue por li Cosmopoli Standard-Lingue (in Novial). No. 19. pp. 410–411. Retrieved 20 September 2023.