APA
(2011). Haynesville surpasses Barnett as leading US shale gas play. : .
Chicago
2011. Haynesville surpasses Barnett as leading US shale gas play. : .
Harvard
(2011). Haynesville surpasses Barnett as leading US shale gas play. : .
MLA
Haynesville surpasses Barnett as leading US shale gas play. : . 2011.