Prior to Raedts's study of 1977, there had only been a few historical publications researching the Children's Crusade. The earliest were by the Frenchman G. de Janssens (1891) and the German Reinhold Röhricht (1876). They analyzed the sources but did not analyze the story. American medievalist Dana Carleton Munro (1913–14), according to Raedts, provided the best analysis of the sources to date and was the first to significantly provide a convincingly sober account of the Crusade stripped of legends. Later, J. E. Hansbery (1938–9) published a correction of Munro's work, but it has since been discredited as based on an unreliable source. German psychiatrist Justus Hecker (1865) did give an original interpretation of the crusade, but it was a polemic about "diseased religious emotionalism" that has since been discredited.