Cita APA (7a ed.)
Sigmund, K. (2010). The calculus of selfishness. Princeton University Press.
Cita Chicago Style (17a ed.)
Sigmund, Karl. The Calculus of Selfishness. Princeton, NJ: Princeton University Press, 2010.
Cita MLA (9a ed.)
Sigmund, Karl. The Calculus of Selfishness. Princeton University Press, 2010.
Precaución: Estas citas no son 100% exactas.