Cita APA (7a ed.)

Ziegler, G. (1999). Numerical distance protection: Principles and application. Siemens.

Cita Chicago Style (17a ed.)

Ziegler, Gerhard. Numerical Distance Protection: Principles and Application. Munich: Siemens, 1999.

Cita MLA (8a ed.)

Ziegler, Gerhard. Numerical Distance Protection: Principles and Application. Siemens, 1999.