Cita APA (7a ed.)
Halmos, P. R. Problems for Mathematicians, Young and Old. Mathematical Association of America.
Cita estilo Chicago (17a ed.)
Halmos, Paul R. Problems for Mathematicians, Young and Old. Washington, EUA: Mathematical Association of America.
Cita MLA (9a ed.)
Halmos, Paul R. Problems for Mathematicians, Young and Old. Mathematical Association of America.
Precaución: Estas citas no son 100% exactas.