| Sonja's Homepage | www.sonjapeters.nl |
| Esther Vergeer | www.esthervergeer.nl |
| ITF Ranking Women singles | onlinesql.itftennis.com |
| ITF Ranking Women doubles | onlinesql.itftennis.com |
| NRR Ranking Women singles | www.skyliner.nl |
| NRR Ranking Women doubles | www.skyliner.nl |
| Sonja's sponsors | |
| NCR | www.ncr.com |
| NRG | www.nrg.nl |
| Invacare Rolstoelen (int. site) | www.invacare.com |
| Invacare Rolstoelen (nl. site) | www.invacare.nl |
| BML·Smulders | www.bml.nl |
| Drukkerij van Mierlo | www.drukkerijvanmierlo.nl |
| ECS Catering | www.ecs-catering.nl |
| Völkl Tennis | www.voelkl.nl |
| Sonja's Homepage | www.sonjapeters.nl |
| Esther Vergeer | www.esthervergeer.nl |
| Yvonne Meusburger | www.meuse.co.at |
| Gert Vos | G. Vos |
| ITF Wheelchair tennis website | www.itfwheelchairtennis.com |
| NOC*NSF | www.sport.nl |
| KNLTB | www.knltb.nl |
| Athens 2004 | www.athens2004.com |
| Sportvrouwen | sportvrouwen.pagina.nl |
| Gehandicaptenreizen | www.gehandicaptenreizen.nl |
| Cheshire oaks WheelchairTennis Club | Cheshire oaks WheelchairTennis Club |
| Forest Wheels | Belgische Forest Wheels Tennisclub |
| Nederlandse stichting voor het gehandicapte kind | www.nsgk.nl |