APA (7th ed.) Citation

Lenk, J. D. Simplified design of voltage-frequency converters.

Chicago Style (17th ed.) Citation

Lenk, John D. Simplified Design of Voltage-frequency Converters.

MLA (8th ed.) Citation

Lenk, John D. Simplified Design of Voltage-frequency Converters.

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