Lua APA (7ú heag.)

Wallich, P. The ghosts of computers past. IEEE spectrum.

Lua i Stíl Chicago (17ú heag.)

Wallich, P. "The Ghosts of Computers Past." IEEE Spectrum .

Lua MLA (9ú heag.)

Wallich, P. "The Ghosts of Computers Past." IEEE Spectrum, .

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