APA (7th ed.) Citation

Brakel, J. D., & Azar, J. J. (1989). Prediction of wellbore trajectory considering bottomhole assembly and drill-bit dynamics. SPE Drilling Engineering, 4, 109. https://doi.org/10.2118/16172-PA

Chicago Style (17th ed.) Citation

Brakel, J. D., and J. J. Azar. "Prediction of Wellbore Trajectory Considering Bottomhole Assembly and Drill-bit Dynamics." SPE Drilling Engineering 4 (1989): 109. https://doi.org/10.2118/16172-PA.

MLA (9th ed.) Citation

Brakel, J. D., and J. J. Azar. "Prediction of Wellbore Trajectory Considering Bottomhole Assembly and Drill-bit Dynamics." SPE Drilling Engineering, vol. 4, 1989, p. 109, https://doi.org/10.2118/16172-PA.