Cita APA (7a ed.)

(1968). Year book covering the year .. Crowell-Collier.

Cita Chicago Style (17a ed.)

Year Book Covering the Year .. [New York]: Crowell-Collier, 1968.

Cita MLA (9a ed.)

Year Book Covering the Year .. Crowell-Collier, 1968.

Precaución: Estas citas no son 100% exactas.