Willaschek, W. (2023). Hans Dieter Schaal: Stage architecture 2001-2022 / preface/Vorwort Wolfgang Willaschek. Edition Axel Menges.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWillaschek, Wolfgang. Hans Dieter Schaal: Stage Architecture 2001-2022 / Preface/Vorwort Wolfgang Willaschek. Stuttgart: Edition Axel Menges, 2023.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWillaschek, Wolfgang. Hans Dieter Schaal: Stage Architecture 2001-2022 / Preface/Vorwort Wolfgang Willaschek. Edition Axel Menges, 2023.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.