APA

Petroleum Technology Transfer Council P., . (2003). Hard rock directional drilling provessuccessful. Houston: Petroleum Technology Transfer Council, PTTC.

Chicago

Petroleum Technology Transfer Council PTTC, . 2003. Hard rock directional drilling provessuccessful. Houston: Petroleum Technology Transfer Council, PTTC.

Harvard

Petroleum Technology Transfer Council P., . (2003). Hard rock directional drilling provessuccessful. Houston: Petroleum Technology Transfer Council, PTTC.

MLA

Petroleum Technology Transfer Council PTTC, . Hard rock directional drilling provessuccessful. Houston: Petroleum Technology Transfer Council, PTTC. 2003.