Cita APA (7a ed.)

Willoughby, D. A. (2005). Horizontal directional drilling: Utility and pipeline applications (First edition.). McGraw-Hill Education.

Cita Chicago Style (17a ed.)

Willoughby, David A. Horizontal Directional Drilling: Utility and Pipeline Applications. First edition. New York, N.Y.: McGraw-Hill Education, 2005.

Cita MLA (8a ed.)

Willoughby, David A. Horizontal Directional Drilling: Utility and Pipeline Applications. First edition. McGraw-Hill Education, 2005.