Bell, R. (1973). Negetive electron affinity devices. Oxford University.
Chicago Edition CitationBell, R.L. Negetive Electron Affinity Devices. London: Oxford University, 1973.
MLA Edition CitationBell, R.L. Negetive Electron Affinity Devices. Oxford University, 1973.
Warning: These citations may not always be 100% accurate.