APA (7th ed.) Citation

Barbour, E. The cool sound of tubes [vacuum tube musical applications]. IEEE spectrum.

Chicago Style (17th ed.) Citation

Barbour, E. "The Cool Sound of Tubes [vacuum Tube Musical Applications]." IEEE Spectrum .

MLA (9th ed.) Citation

Barbour, E. "The Cool Sound of Tubes [vacuum Tube Musical Applications]." IEEE Spectrum, .

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