APA Citation

Friedrichs, K. O., & Friedrichs, K. O. (1967). De Pitagoras a Einstein. Cali: Norma.

Chicago Style Citation

Friedrichs, Kurt Otto, and Kurt Otto Friedrichs. De Pitagoras a Einstein. Cali: Norma, 1967.

MLA Citation

Friedrichs, Kurt Otto, and Kurt Otto Friedrichs. De Pitagoras a Einstein. Cali: Norma, 1967.

Warning: These citations may not always be 100% accurate.