Obst, P. (2011). Age and gender comparisons of driving while sleepy: Behaviours and risk perceptions. Elsevier Ltd.
Lua i Stíl Chicago (17ú heag.)Obst, Patricia. Age and Gender Comparisons of Driving While Sleepy: Behaviours and Risk Perceptions. Netherlands: Elsevier Ltd, 2011.
Lua MLA (8ú heag.)Obst, Patricia. Age and Gender Comparisons of Driving While Sleepy: Behaviours and Risk Perceptions. Elsevier Ltd, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.