Zill, D. G. (2009). A First Course in Differential Equations: With modeling applications (9th ed.). Brooks/Cole.
Chicago-čujuhus (17. p.)Zill, Dennis G. A First Course in Differential Equations: With Modeling Applications. 9th ed. Pacific Grove: Brooks/Cole, 2009.
MLA-čujuhus (9. p.)Zill, Dennis G. A First Course in Differential Equations: With Modeling Applications. 9th ed. Brooks/Cole, 2009.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.