Cita APA (7a ed.)

Gaiam Americas, Inc, & Hawking, S. (2011). Into the universe with Stephen Hawking. Gaiam.

Cita Chicago Style (17a ed.)

Gaiam Americas, Inc, y Stephen Hawking. Into the Universe with Stephen Hawking. [Boulder, Colo.]: Gaiam, 2011.

Cita MLA (8a ed.)

Gaiam Americas, Inc, y Stephen Hawking. Into the Universe with Stephen Hawking. Gaiam, 2011.

Precaución: Estas citas no son 100% exactas.