Lua APA (7ú heag.)

Williams, T. I. (1987). The history of invention. Facts on File.

Lua i Stíl Chicago (17ú heag.)

Williams, Trevor Illtyd. The History of Invention. New York, N Y: Facts on File, 1987.

Lua MLA (9ú heag.)

Williams, Trevor Illtyd. The History of Invention. Facts on File, 1987.

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