APA

Horowitz B., . (2014). The hard thing about hard things. Harper Business, New York: Harper Business.

Chicago

Horowitz Ben, . 2014. The hard thing about hard things. Harper Business, New York: Harper Business.

Harvard

Horowitz B., . (2014). The hard thing about hard things. Harper Business, New York: Harper Business.

MLA

Horowitz Ben, . The hard thing about hard things. Harper Business, New York: Harper Business. 2014.