Cita APA (7th ed.)
The Universal Encyclopedia of Machines. (1972). How things work (1a Ed.). PALADIN.
Cita Chicago (17th ed.)
The Universal Encyclopedia of Machines. How Things Work. 1a Ed. PALADIN, 1972.
Cita MLA (9th ed.)
The Universal Encyclopedia of Machines. How Things Work. 1a Ed. PALADIN, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.