APA Edition Citation

Valley Jr, G. E., & Wallman , H. (1948). Vacum tube amplifiers.

Chicago Edition Citation

Valley Jr, George E., and Henry Wallman. Vacum Tube Amplifiers. 1948.

MLA Edition Citation

Valley Jr, George E., and Henry Wallman. Vacum Tube Amplifiers. 1948.

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