Cita APA (7a ed.)

Sanger, D. E., & Perlroth, N. Internet giants erect barriers to thwart spy agencies. Manila Bulletin.

Cita Chicago Style (17a ed.)

Sanger, David E., y Nicole Perlroth. "Internet Giants Erect Barriers to Thwart Spy Agencies." Manila Bulletin .

Cita MLA (9a ed.)

Sanger, David E., y Nicole Perlroth. "Internet Giants Erect Barriers to Thwart Spy Agencies." Manila Bulletin, .