Lua APA (7ú heag.)

Não informado. (1968). Government Reports Index. U.S. Department of Commerce, National Technical Information Service.

Lua i Stíl Chicago (17ú heag.)

Não informado. Government Reports Index. Washington: U.S. Department of Commerce, National Technical Information Service, 1968.

Lua MLA (8ú heag.)

Não informado. Government Reports Index. U.S. Department of Commerce, National Technical Information Service, 1968.

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