APA (7th ed.) Citation

Deutsch, L. P. (1999). Source code: Open or closed. IEEE Spectrum, 36(8), 6.

Chicago Style (17th ed.) Citation

Deutsch, L. Peter. "Source Code: Open or Closed." IEEE Spectrum 36, no. 8 (1999): 6.

MLA (9th ed.) Citation

Deutsch, L. Peter. "Source Code: Open or Closed." IEEE Spectrum, vol. 36, no. 8, 1999, p. 6.