Piaggio, H. T. H. (1920). An Elementary Treatise on Differential Equations and Their Applications. Modern Book Centre.
Tohutoru Kātū Chicago (17th ed.)Piaggio, H. T. H. An Elementary Treatise on Differential Equations and Their Applications. London: Modern Book Centre, 1920.
Tohutoro MLA (9th ed.)Piaggio, H. T. H. An Elementary Treatise on Differential Equations and Their Applications. Modern Book Centre, 1920.
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