Παραπομπή APA

Bell, R. (1973). Negetive electron affinity devices. Oxford University.

Παραπομπή Chicago Style

Bell, R.L. Negetive Electron Affinity Devices. London: Oxford University, 1973.

Παραπομπή MLA

Bell, R.L. Negetive Electron Affinity Devices. Oxford University, 1973.