Sharma, B. D. (1999). Differential Equations (15th ed.). Kedar Nath Ram Nath.
Cita Chicago (17th ed.)Sharma, Bhu Dev. Differential Equations. 15th ed. Meerut: Kedar Nath Ram Nath, 1999.
Cita MLA (9th ed.)Sharma, Bhu Dev. Differential Equations. 15th ed. Kedar Nath Ram Nath, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.