| Uitgeverij-binderij G.F. Callenbach 1854 - 1975 | G.G. Callenbach | |
| Ecomanagement | Callenbach, Ernest | |
| PROFETEN EN PROFETISCHE GESCHRIFTEN | Callenbach | VBK Media |
| A Citizen Legislature/A People's Parliament | Callenbach, Ernest | |
| A Citizen Legislature/A People's Parliament | Callenbach, Ernest |
