Cita APA (7th ed.)

LANGER, R. E. (1954). First course in ordinary differen-: Tial equations. John Wiley.

Cita Chicago (17th ed.)

LANGER, Rudolph E. First Course in Ordinary Differen-: Tial Equations. New York: John Wiley, 1954.

Cita MLA (9th ed.)

LANGER, Rudolph E. First Course in Ordinary Differen-: Tial Equations. John Wiley, 1954.