Lua APA (7ú heag.)

Roytvarf. (2013). Thinking in Problems (1.). Birkhäuser Boston.

Lua i Stíl Chicago (17ú heag.)

Roytvarf. Thinking in Problems. 1. Birkhäuser Boston, 2013.

Lua MLA (8ú heag.)

Roytvarf. Thinking in Problems. 1. Birkhäuser Boston, 2013.

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