Kneeland, S. (2005). Solving problems. Viva Books.
Cita Chicago (17th ed.)Kneeland, Steve. Solving Problems. New Delhi: Viva Books, 2005.
Cita MLA (8th ed.)Kneeland, Steve. Solving Problems. Viva Books, 2005.
Atenció: Aquestes cites poden no estar 100% correctes.