Cita APA (7th ed.)

Piaggio, H. T. H. (1920). Differential Equations (1999 Reprint.). G. Bell & Sons.

Cita Chicago (17th ed.)

Piaggio, H. T. H. Differential Equations. 1999 Reprint. London: G. Bell & Sons, 1920.

Cita MLA (9th ed.)

Piaggio, H. T. H. Differential Equations. 1999 Reprint. G. Bell & Sons, 1920.