Cita APA (7a ed.)

Sperry-Sun. (1992). An engineering approach to horizontal drilling. Sperry-Sun.

Cita Chicago Style (17a ed.)

Sperry-Sun. An Engineering Approach to Horizontal Drilling. [S.l.]: Sperry-Sun, 1992.

Cita MLA (8a ed.)

Sperry-Sun. An Engineering Approach to Horizontal Drilling. Sperry-Sun, 1992.