Cita APA

Heyerdahl, T. (1996). Green was the Earth on the seventh day. Little, Brown and company, BoSton: [s.n].

Citación estilo Chicago

Heyerdahl, Thor. Green Was the Earth On the Seventh Day. Little, Brown and company, BoSton: [s.n], 1996.

Cita MLA

Heyerdahl, Thor. Green Was the Earth On the Seventh Day. Little, Brown and company, BoSton: [s.n], 1996.