Citazione Stile APA (7a Edizione)

Johnson, K. (1993). The centre of the earth ([Hardback ed.].). Watts Books.

Citazione stile Chigago Style (17a edizione)

Johnson, Kipchak. The Centre of the Earth. [Hardback ed.]. London: Watts Books, 1993.

Citatione MLA (9a ed.)

Johnson, Kipchak. The Centre of the Earth. [Hardback ed.]. Watts Books, 1993.