| Year | 2014 |
| Date | 10-Jan |
| Volume | 212 |
| Issue | 4,473 |
| Page | 118 |
| Category | Internal Combustion |
| Part | 3 |
| Title | Problems of Combustion in Small Engines |
| Author | Graham Astbury |
| Notes | Explains the theory and practice. Gas carburettors, propane regulator, practical solutions, other fuel types and engines, references |