LEFFINGWELL RICHARD. (2019). BASIC MATH DOUBLING AND MUTIPLYING (2018 Ed.). HEINEMANN LIBRARY.
Chicago-čujuhus (17. p.)LEFFINGWELL RICHARD. BASIC MATH DOUBLING AND MUTIPLYING. 2018 Ed. MINNESOTA: HEINEMANN LIBRARY, 2019.
MLA-čujuhus (9. p.)LEFFINGWELL RICHARD. BASIC MATH DOUBLING AND MUTIPLYING. 2018 Ed. HEINEMANN LIBRARY, 2019.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.