Eyal, N. (2014). Hooked: How to build habit-forming products. Portfolio/Penguin.
Lua i Stíl Chicago (17ú heag.)Eyal, Nir. Hooked: How to Build Habit-forming Products. London: Portfolio/Penguin, 2014.
Lua MLA (9ú heag.)Eyal, Nir. Hooked: How to Build Habit-forming Products. Portfolio/Penguin, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.