IndyCar Classic Referensi
↑ Robinson, Mark (March 24, 2019). "Herta becomes youngest race winner in Indy car history" . IndyCar Series. Diakses tanggal March 31, 2019 . Pemeliharaan CS1: Status URL (link ) ↑ Eubanks, Michael (March 24, 2019). "Colton Herta wins inaugural IndyCar Classic at COTA, becomes youngest winner in series history" . NBCSports . Diakses tanggal March 31, 2019 . ↑ Martin, Bruce (March 13, 2020). "IndyCar cancels opener; all races through April also canceled" . NBCSports. Diakses tanggal March 14, 2020 . Pemeliharaan CS1: Status URL (link ) ↑ "Circuit of the Americas Welcomes AutoNation IndyCar Challenge April 24-26, 2020" . Circuit of the Americas . October 15, 2019. Diakses tanggal January 7, 2022 . Pemeliharaan CS1: Status URL (link ) ↑ Burkhart, Ross (October 1, 2020). "IndyCar Series won't stop at Circuit of the Americas in 2021" . Austin American-Statesman . Diakses tanggal January 23, 2021 . Pemeliharaan CS1: Status URL (link )
