APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Friedrichs, K. O. De Pitagoras a Einstein. Bogotá: Norma, 1967.

MLA (9th ed.) Citation

Friedrichs, K. O. De Pitagoras a Einstein. Norma, 1967.

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