Heinrich, G. (1991). How to refine in the future. Wiley.
Cita Chicago Style (17a ed.)Heinrich, G. How to Refine in the Future. Chichester, England: Wiley, 1991.
Cita MLA (9a ed.)Heinrich, G. How to Refine in the Future. Wiley, 1991.
Precaución: Estas citas no son 100% exactas.