Wolf Tony. (2009). The book of the earth, many questions and many answers. Euro Books.
Cita Chicago (17th ed.)Wolf Tony. The Book of the Earth, Many Questions and Many Answers. Mumbai: Euro Books, 2009.
Cita MLA (9th ed.)Wolf Tony. The Book of the Earth, Many Questions and Many Answers. Euro Books, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.