Greenwald, H. P., Howarth, H. C., & Rice, G. S. (1930). Effectiveness of different size rock dusts in preventing coal-dust explosions in mines. [publisher not identified].
Chicago Style (17th ed.) CitationGreenwald, H. P., H. C. Howarth, and George S. Rice. Effectiveness of Different Size Rock Dusts in Preventing Coal-dust Explosions in Mines. Washington, D.C.: [publisher not identified], 1930.
MLA (9th ed.) CitationGreenwald, H. P., et al. Effectiveness of Different Size Rock Dusts in Preventing Coal-dust Explosions in Mines. [publisher not identified], 1930.
Warning: These citations may not always be 100% accurate.