APA (7th ed.) Citation

Tegmark, M. (2003). Universos paralelos. Scientific American Mexico, 2(13), 36.

Chicago Style (17th ed.) Citation

Tegmark, Max. "Universos Paralelos." Scientific American Mexico 2, no. 13 (2003): 36.

MLA (9th ed.) Citation

Tegmark, Max. "Universos Paralelos." Scientific American Mexico, vol. 2, no. 13, 2003, p. 36.