abdel karim, a. i. (1964). difference equations. the institute of national planning.
Citazione stile Chigago Style (17a edizione)abdel karim, abbas i. Difference Equations. cairo: the institute of national planning, 1964.
Citatione MLA (9a ed.)abdel karim, abbas i. Difference Equations. the institute of national planning, 1964.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.