| Verfasser | Häufigkeit |
| Petzke, Jesper 1979- |
6 |
| Petzke, Jürgen |
3 |
| Becher, Tobias Hermann 1981- |
2 |
| Bein, Berthold Helmut 1963- |
2 |
| Gräsner, Jan-Thorsten 1971- |
2 |
| Petzke, Frank |
2 |
| Weiler, Norbert |
2 |
| Bertini, Marco |
1 |
| Izaret, Jean-Manuel |
1 |
| Jenett, Daniel |
1 |
| Nord, Ilona 1966- |
1 |
| O'Reilly for Higher Education (Firm) |
1 |
| Petzke, Amadeus |
1 |
| Petzke, Ingo 1947- |
1 |
| Petzke, Judith |
1 |
| Petzke, Juergen |
1 |
| Petzke, Jürgen 1945- |
1 |
| Petzke, Klaus Jürgen |
1 |
| Pineda, John |
1 |
| Safari, an O'Reilly Media Company |
1 |