GARDNER MARTIN. (1977). MATHEMATICAL MAGIC SHOW. PENGUIN BOOKS.
Cita Chicago (17th ed.)GARDNER MARTIN. MATHEMATICAL MAGIC SHOW. LONDON: PENGUIN BOOKS, 1977.
Cita MLA (9th ed.)GARDNER MARTIN. MATHEMATICAL MAGIC SHOW. PENGUIN BOOKS, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.