Casio FX-991DE X wissenschaftlicher ClassWiz Rechner mit natürlichem Display : Amazon.de: Bürobedarf & Schreibwaren
Amazon.com: Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Everything Else
Casio FX-991 DE X + Book: In Focus II - The Entry to the Casio FX-991 DE X : Amazon.de: Stationery & Office Supplies
fx-991ES and fx-115ES Practice Calculations: Using the Casio fx-991ES Plus and fx-115ES Plus Calculators: Brown, Allen: 9781693746963: Amazon.com: Books