Literature:
Franz Gertsch – Rüschegg | Angelika Affentranger-Kirchrath | 2020 | Scheidegger & Spiess | ISBN: 978–3–85881–663–4 | S. 33
Franz Gertsch – Thomas Ruff | Rainer Michael Mason, Helmut Friedel, Ulrich Loock | 1991 | ISBN: 978–3–907509–78–4
Franz Gertsch – Rüschegg | Angelika Affentranger-Kirchrath | 2020 | Scheidegger & Spiess | ISBN: 978–3–85881–663–4 | S. 33
Franz Gertsch – Thomas Ruff | Rainer Michael Mason, Helmut Friedel, Ulrich Loock | 1991 | ISBN: 978–3–907509–78–4