Humphrey, J. (2021). High Performance. Penguin.
Lua i Stíl Chicago (17ú heag.)Humphrey, Jake. High Performance. Penguin, 2021.
Lua MLA (9ú heag.)Humphrey, Jake. High Performance. Penguin, 2021.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.