Παραπομπή σε μορφή APA (7η εκδ.)

Horowitz Ben. (2014). The hard thing about hard things: Building a business when there are no easy answers. HarperCollins.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Horowitz Ben. The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers. New York: HarperCollins, 2014.

Παραπομπή σε μορφή MLA (9th εκδ.)

Horowitz Ben. The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers. HarperCollins, 2014.