Greenhalgh, C. (1995). Supply Side Puzzles.
Cita Chicago (17th ed.)Greenhalgh, C. Supply Side Puzzles. 1995.
Cita MLA (9th ed.)Greenhalgh, C. Supply Side Puzzles. 1995.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)