APA (7th ed.) Citation

Ash, S. H., & Brooks, E. M. (1930). Automatic electric man-hoist for slopes or inclines. [publisher not identified].

Chicago Style (17th ed.) Citation

Ash, S. H., and E. M. Brooks. Automatic Electric Man-hoist for Slopes or Inclines. Washington, D.C.: [publisher not identified], 1930.

MLA (9th ed.) Citation

Ash, S. H., and E. M. Brooks. Automatic Electric Man-hoist for Slopes or Inclines. [publisher not identified], 1930.