Gaya APA

Piketty, T., Goldhammer, A. (2014). E-book Capital in the Twenty-First Century . London: Th e Belknap Press of Harvard University Press.

Gaya MLA

Piketty, Thomas., Goldhammer, Arthur. "E-book Capital in the Twenty-First Century". London: Th e Belknap Press of Harvard University Press, 2014. Text.