Cita APA (7th ed.)

(2013). Bakken Shale ; the Playbook. [s.n.].

Cita Chicago (17th ed.)

Bakken Shale ; the Playbook. [S.l.]: [s.n.], 2013.

Cita MLA (9th ed.)

Bakken Shale ; the Playbook. [s.n.], 2013.