Horowitz Ben. (2014). The hard thing about hard things: Building a business when there are no easy answers. HarperCollins.
Lua i Stíl Chicago (17ú heag.)Horowitz Ben. The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers. New York: HarperCollins, 2014.
Lua MLA (9ú heag.)Horowitz Ben. The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers. HarperCollins, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.