Childs, W. H. J. (1972). Physical constants selected for students (9th ed.). Chapman and Hall.
Cita Chicago Style (17a ed.)Childs, W. H. J. Physical Constants Selected for Students. 9th ed. London: Chapman and Hall, 1972.
Cita MLA (9a ed.)Childs, W. H. J. Physical Constants Selected for Students. 9th ed. Chapman and Hall, 1972.
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