Beck, H. F. (1970). The age of technology. Concordia Pub. House.
Lua i Stíl Chicago (17ú heag.)Beck, Hubert F. The Age of Technology. St. Louis: Concordia Pub. House, 1970.
Lua MLA (8ú heag.)Beck, Hubert F. The Age of Technology. Concordia Pub. House, 1970.
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