Piaggio, H. (1960). Elementary treatise on differential equations and their applications. G Bell and sons.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPiaggio, H. Elementary Treatise on Differential Equations and Their Applications. London: G Bell and sons, 1960.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPiaggio, H. Elementary Treatise on Differential Equations and Their Applications. G Bell and sons, 1960.
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