Cita APA (7th ed.)
33 metal producing. [Penton Pub., etc.].
Cita Chicago (17th ed.)
33 Metal Producing. [Cleveland, Ohio, etc.]: [Penton Pub., etc.].
Cita MLA (9th ed.)
33 Metal Producing. [Penton Pub., etc.].
Atenció: Aquestes cites poden no estar 100% correctes.