APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.