Cita APA (7a ed.)
(1997). Positivity. Kluwer Academic Publishers.
Cita Chicago Style (17a ed.)
Positivity. [Dordrecht]: Kluwer Academic Publishers, 1997.
Cita MLA (9a ed.)
Positivity. Kluwer Academic Publishers, 1997.
Precaución: Estas citas no son 100% exactas.