American Bibliographical Center. Historical Abstracts -Part. B, Twentieth Century Abstracts. ABC-Clio.
Cita Chicago Style (17a ed.)American Bibliographical Center. Historical Abstracts -Part. B, Twentieth Century Abstracts. Santa Bárbara: ABC-Clio.
Cita MLA (9a ed.)American Bibliographical Center. Historical Abstracts -Part. B, Twentieth Century Abstracts. ABC-Clio.
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