Παραπομπή APA

Feynman, R. P. (1997). Six not-so-easy pieces: Einstein's relativity, symmetry and space-time. Penguin.

Παραπομπή Chicago Style

Feynman, Richard P. Six Not-so-easy Pieces: Einstein's Relativity, Symmetry and Space-time. London: Penguin, 1997.

Παραπομπή MLA

Feynman, Richard P. Six Not-so-easy Pieces: Einstein's Relativity, Symmetry and Space-time. Penguin, 1997.