Roland W. Freudenmann, Florian Öxler, Sabine Bernschneider-Reif (2006). The origin of MDMA (ecstasy) revisited: the true story reconstructed from the original documents. Addiction 101, 1241–1245. PMID16911722PDF
Benzenhöfer, U. and Passie, T. (2006). The early history of "Ecstasy." Nervenarzt 77, 95–99. (Artikel på tyska) PMID PDF
Roland W. Freudenmann, Florian Öxler, Sabine Bernschneider-Reif (2006). The origin of MDMA (ecstasy) revisited: the true story reconstructed from the original documents. Addiction 101, 1241–1245. PMID16911722PDF