| Year | 2014 |
| Month | October |
| Volume | 36 |
| Issue | 4 |
| Page | 129 |
| Author | Rizzo |
| Subject | Stationary Engine |
| Key Word | Double Acting Assembly Displacer Extension Sockets Power Unit Power Pistons Con Rods Clevis Sub-Assembly |
| Article Title | QUAD - a Four Cylinder Double-acting Stirling Engine |