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.
Precaución: Estas citas no son 100% exactas.