APA

Kolstad E., Brady L. & Marchand S. (2007). Purpose-built land rigs produce step change in drilling time, cost, and opportunities. : .

Chicago

Kolstad E.S, Brady L.S and Marchand S.P. 2007. Purpose-built land rigs produce step change in drilling time, cost, and opportunities. : .

Harvard

Kolstad E., Brady L. and Marchand S. (2007). Purpose-built land rigs produce step change in drilling time, cost, and opportunities. : .

MLA

Kolstad E.S, Brady L.S and Marchand S.P. Purpose-built land rigs produce step change in drilling time, cost, and opportunities. : . 2007.