| Leo Temprano |
|
| Maury |
|
| Michel |
|
| NVPH |
|
| Philatelia Hungarica Catalog |
|
| PMRstamps.org |
|
| POFIS |
|
| Polish Stamps Catalog (Fischer) |
|
| RHM |
|
| Romfilatelia |
|
| Sakura |
|
| Sassone |
|
| Seven Seas Stamps |
|
| Siddiqui Catalogue |
|
| Soloviev |
|
| South African Stamp Catalog |
|
| Stamp Number |
|
| Stanley Gibbons |
|
| Unificato |
|
| WADP Numbering System - WNS |
|