found: LCCN 22-19198: His Logik, 1910(hdg.: Natorp, Paul Gerhard, 1854-1924; usage: Paul Natorp)
found: Matsuura, T. Natorupu ippan kyōikugaku no kenkyū, 1987:preface (Paul Natorp)
found: Natorp, Paul. Sozialpädagogik : Theorie der Willenserziehung auf der Grundlage der Gemeinschaft, 1904:title page (von Paul Natorp)
found: LC data base, August 8, 1988(hdg.: Natorp, Paul Gerhard, 1854-1924; usage: Paul Natorp)
found: German Wikipedia, viewed December 6, 2021(Paul Natorp; Paul Gerhard Natorp; born January 24, 1854, in Düsseldorf; died August 17, 1924, in Marburg; German philosopher and educator; co-founder of the Marburg school of Neo-Kantianism; obtained his doctorate in 1876 in Strassburg; taught at the Philipps-Universität Marburg)
found: Deutsche Nationalbibliothek online catalog, viewed December 6, 2021(authorized access point: Natorp, Paul; other data in authority record: German philosopher; born 1854 in Düsseldorf; died 1924, in Marburg)