Cita APA (7th ed.)

Addams, J. (1981). Twenty years at Hull-House. New American Library.

Cita Chicago (17th ed.)

Addams, Jane. Twenty Years at Hull-House. New York, Estados Unidos: New American Library, 1981.

Cita MLA (9th ed.)

Addams, Jane. Twenty Years at Hull-House. New American Library, 1981.