Cita APA (7a ed.)
Barker, S. F. Philosophy of Mathematics. Prentice-Hall.
Cita estilo Chicago (17a ed.)
Barker, Stephen F. Philosophy of Mathematics. Englewood Cliffs, EUA: Prentice-Hall.
Cita MLA (9a ed.)
Barker, Stephen F. Philosophy of Mathematics. Prentice-Hall.
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