Lua APA (7ú heag.)

Não informado. (1942). Machine tools. National Machine Tool Builders Association.

Lua i Stíl Chicago (17ú heag.)

Não informado. Machine Tools. Cleveland, Ohio: National Machine Tool Builders Association, 1942.

Lua MLA (8ú heag.)

Não informado. Machine Tools. National Machine Tool Builders Association, 1942.

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