Amstrup, Niels. 1987. “Johs. Nielsen, 1864 - Da Europa Gik Af Lave. Odense University Studies in History Social Sciences, Vol. 102, Odense Universitetsforlag, 1987, 439 s., 240,00 Kr. (eksklusive moms)”. Politica 19 (4):516. https://doi.org/10.7146/politica.v19i4.68873.