Cita APA (7th ed.)

Garfinkel, S. (1995). PGP: Pretty good privacy. O'Reilly & Associates.

Cita Chicago (17th ed.)

Garfinkel, Simson. PGP: Pretty Good Privacy. Sebastopol, Calif: O'Reilly & Associates, 1995.

Cita MLA (9th ed.)

Garfinkel, Simson. PGP: Pretty Good Privacy. O'Reilly & Associates, 1995.