"Championship standings". sbk.perugiatiming.com. Perugia Timing. 12 September 1999. Archived from the original on 10 April 2014. Retrieved 24 December 2014.
"Manufacturer standings". sbk.perugiatiming.com. Perugia Timing. 12 September 1999. Archived from the original on 10 April 2014. Retrieved 24 December 2014.
"Championship standings". sbk.perugiatiming.com. Perugia Timing. 12 September 1999. Archived from the original on 10 April 2014. Retrieved 24 December 2014.
"Manufacturer standings". sbk.perugiatiming.com. Perugia Timing. 12 September 1999. Archived from the original on 10 April 2014. Retrieved 24 December 2014.