APA (7th ed.) Citation

Pyles, H. G. (1971). Development of a universal drilling machine. Mining Congress Journal, 57, 21.

Chicago Style (17th ed.) Citation

Pyles, H. G. "Development of a Universal Drilling Machine." Mining Congress Journal 57 (1971): 21.

MLA (9th ed.) Citation

Pyles, H. G. "Development of a Universal Drilling Machine." Mining Congress Journal, vol. 57, 1971, p. 21.

Warning: These citations may not always be 100% accurate.