Cita APA (7th ed.)

Estados Unidos. Library of Congress. (1959). Classification: History class D, general and old world (2a. ed.). Library of Congress.

Cita Chicago (17th ed.)

Estados Unidos. Library of Congress. Classification: History Class D, General and Old World. 2a. ed. Washington: Library of Congress, 1959.

Cita MLA (9th ed.)

Estados Unidos. Library of Congress. Classification: History Class D, General and Old World. 2a. ed. Library of Congress, 1959.