Cita APA (7a ed.)

Garfinkel, S., & Spafford, G. (1997). Web security and commerce. [S.n.].

Cita Chicago Style (17a ed.)

Garfinkel, Simson, y Gene Spafford. Web Security and Commerce. Cambridge: [S.n.], 1997.

Cita MLA (9a ed.)

Garfinkel, Simson, y Gene Spafford. Web Security and Commerce. [S.n.], 1997.