Cita APA (7th ed.)

SIERPINSKI, W. (1970). 250 problems in elementary number theory. Elsevier.

Cita Chicago (17th ed.)

SIERPINSKI, W. 250 Problems in Elementary Number Theory. New York: Elsevier, 1970.

Cita MLA (9th ed.)

SIERPINSKI, W. 250 Problems in Elementary Number Theory. Elsevier, 1970.