Meyer, J. S. (1956). World book of great inventions. The World Publishing.
Cita Chicago (17th ed.)Meyer, Jerome S. World Book of Great Inventions. Cleveland: The World Publishing, 1956.
Cita MLA (9th ed.)Meyer, Jerome S. World Book of Great Inventions. The World Publishing, 1956.
Atenció: Aquestes cites poden no estar 100% correctes.