Cita APA (7th ed.)

KEYFITZ, N. (1968). Introduction to the mathematics of population; 2nd ed. Addison-Wesley.

Cita Chicago (17th ed.)

KEYFITZ, Nathan. Introduction to the Mathematics of Population; 2nd Ed. Reading, Mass: Addison-Wesley, 1968.

Cita MLA (9th ed.)

KEYFITZ, Nathan. Introduction to the Mathematics of Population; 2nd Ed. Addison-Wesley, 1968.