APA (7th ed.) Citation

(1977). 33 metal producing. [Penton Pub., etc.].

Chicago Style (17th ed.) Citation

33 Metal Producing. [Cleveland, Ohio, etc.]: [Penton Pub., etc.], 1977.

MLA (9th ed.) Citation

33 Metal Producing. [Penton Pub., etc.], 1977.

Warning: These citations may not always be 100% accurate.