F. Beilstein: Handbuch der organischen Chemie, 3. Auflage, 1. Band. Verlag Leopold Voss, 1893. S. 483. Volltext
doi.org
Sayantan Paul, Asish K. Bhattacharya: A Short Review on the Synthetic Routes for the Antiepileptic Drug ( S )-Levetiracetam. In: Organic Process Research & Development. Band28, Nr.4, 19. April 2024, S.924–936, doi:10.1021/acs.oprd.4c00002.