Cita APA (7a ed.)

Library of Congress. Classification ht. social groups: Communities, classes, races completing class H: social sciences. Printed as manuscript.

Cita Chicago Style (17a ed.)

Library of Congress. Classification Ht. Social Groups: Communities, Classes, Races Completing Class H: Social Sciences. Printed as Manuscript. Washington : Government printing office, 1915.

Cita MLA (8a ed.)

Library of Congress. Classification Ht. Social Groups: Communities, Classes, Races Completing Class H: Social Sciences. Printed as Manuscript.