Cita APA (7a ed.)

Wolf Tony. (2009). The book of the earth, many questions and many answers. Euro Books.

Cita Chicago Style (17a ed.)

Wolf Tony. The Book of the Earth, Many Questions and Many Answers. Mumbai: Euro Books, 2009.

Cita MLA (9a ed.)

Wolf Tony. The Book of the Earth, Many Questions and Many Answers. Euro Books, 2009.