Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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

Atenció: Aquestes cites poden no estar 100% correctes.