APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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