Hand, E. N. (1902). A mechanical universe. Inland printing company.
Lua i Stíl Chicago (17ú heag.)Hand, Edwy Nathan. A Mechanical Universe. [Spokane, Wash.]: Inland printing company, 1902.
Lua MLA (8ú heag.)Hand, Edwy Nathan. A Mechanical Universe. Inland printing company, 1902.
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