Cita APA (7a ed.)

Beard, L., & Marrill, R. (2014). The twenty first century book. Phaidon.

Cita Chicago Style (17a ed.)

Beard, Lee, y Rebecca Marrill. The Twenty First Century Book. Londres: Phaidon, 2014.

Cita MLA (8a ed.)

Beard, Lee, y Rebecca Marrill. The Twenty First Century Book. Phaidon, 2014.