APA (7th ed.) Citation

Ray, R. W. (1990). Evaluation of high rotary speed drill bit performance. [publisher not identified].

Chicago Style (17th ed.) Citation

Ray, Randy Wayne. Evaluation of High Rotary Speed Drill Bit Performance. [Place of publication not identified]: [publisher not identified], 1990.

MLA (9th ed.) Citation

Ray, Randy Wayne. Evaluation of High Rotary Speed Drill Bit Performance. [publisher not identified], 1990.