The National Safety Competition of 1961 /
by John C. Machisak, Virginia E. Wrenn, and Elizabeth K. Elsner.
APA Citation
Machisak, J. C., Elsner, E. K., Wrenn, V. E. (1963). The National Safety Competition of 1961. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines.
MLA Citation
Machisak, John C, Elizabeth K Elsner, and Virginia E Wrenn. The National Safety Competition of 1961. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines, 1963.
Warning: These citations may not always be complete (especially for serials).