Perls, F. S. (2019). Archivmaterialien zu Frederick S. Perls, 1893-1970.
Chicago Style (17th ed.) CitationPerls, Frederick S. Archivmaterialien Zu Frederick S. Perls, 1893-1970. 2019.
MLA (8th ed.) CitationPerls, Frederick S. Archivmaterialien Zu Frederick S. Perls, 1893-1970. 2019.
Warning: These citations may not always be 100% accurate.