APA
(2018). U.S. shale drives rig count recovery in 2017. : .
Chicago
2018. U.S. shale drives rig count recovery in 2017. : .
Harvard
(2018). U.S. shale drives rig count recovery in 2017. : .
MLA
U.S. shale drives rig count recovery in 2017. : . 2018.