Cita APA (7a ed.)
Hetao Liu, J. A First Course in the Qualitative Theory of Differential Equations. Prentice-Hall.
Cita estilo Chicago (17a ed.)
Hetao Liu, James. A First Course in the Qualitative Theory of Differential Equations. Upper Saddle River, EUA: Prentice-Hall.
Cita MLA (9a ed.)
Hetao Liu, James. A First Course in the Qualitative Theory of Differential Equations. Prentice-Hall.
Precaución: Estas citas no son 100% exactas.