| name | World Series 99 |
| format | NAOMI |
| company | Sega Software R&D Dept. 1 |
| role | Developer |
| specificrole | |
| credited | Yes |
| name | World Series 99 |
| format | NAOMI |
| company | Major League Baseball Properties |
| role | Licensor |
| specificrole | |
| credited | Yes |
| name | World Series 99 |
| format | NAOMI |
| company | Major League Baseball Players Association |
| role | Licensor |
| specificrole | |
| credited | Yes |
| name | World Series 99 |
| file | Sega Arcade History JP EnterBrain Book-1.pdf |
| filepage | 168 |
| name | World Series 99 |
| file | SegaProductsTerminationAnnouncement 2016-11 JP.pdf |
| filepage | |
| name | World Series 99 |
| file | SegaProductsTerminationAnnouncement 2016-12.pdf |
| filepage | |
| name | World Series 99 |
| franchise | World Series Baseball (franchise) |