Cita APA (7a ed.)
Feynman, R. P., Penrose, R., Goodstein, D. L., & Neugebauer, G. Six Not-So-Easy Pieces: Einstein's Relativity, Symetry, and Space-Time. Perseus.
Cita estilo Chicago (17a ed.)
Feynman, Richard P., Roger Penrose, David L. Goodstein, y Gerry Neugebauer. Six Not-So-Easy Pieces: Einstein's Relativity, Symetry, and Space-Time. Cambridge, EUA: Perseus.
Cita MLA (9a ed.)
Feynman, Richard P., et al. Six Not-So-Easy Pieces: Einstein's Relativity, Symetry, and Space-Time. Perseus.
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