APA-Zitierstil (7. Ausg.)

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

Chicago-Zitierstil (17. Ausg.)

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

MLA-Zitierstil (9. Ausg.)

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