Cita APA (7a ed.)
Bird, J. M. Einstein's Theories of Relativity and Gravitation: A Selection of Material [...]. Kessinger.
Cita estilo Chicago (17a ed.)
Bird, James Malcolm. Einstein's Theories of Relativity and Gravitation: A Selection of Material [...]. EUA: Kessinger.
Cita MLA (9a ed.)
Bird, James Malcolm. Einstein's Theories of Relativity and Gravitation: A Selection of Material [...]. Kessinger.
Precaución: Estas citas no son 100% exactas.