SIERPINSKI, W. (1970). 250 problems in elementary number theory. Elsevier.
Chicago-čujuhus (17. p.)SIERPINSKI, W. 250 Problems in Elementary Number Theory. New York: Elsevier, 1970.
MLA-čujuhus (9. p.)SIERPINSKI, W. 250 Problems in Elementary Number Theory. Elsevier, 1970.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.