Cita APA (7a ed.)

Halmos, P. R. (1991). Problems for mathematicians young and old (1a ed.). American Mathematical Society.

Cita Chicago Style (17a ed.)

Halmos, Paul R. Problems for Mathematicians Young and Old. 1a ed. U.S.A.: American Mathematical Society, 1991.

Cita MLA (9a ed.)

Halmos, Paul R. Problems for Mathematicians Young and Old. 1a ed. American Mathematical Society, 1991.