Cita APA (7a ed.)

(1967). The 1967 World Book Year Book. Field Enterprises Educational Corporation.

Cita Chicago Style (17a ed.)

The 1967 World Book Year Book. Chicago, Estados Unidos: Field Enterprises Educational Corporation, 1967.

Cita MLA (9a ed.)

The 1967 World Book Year Book. Field Enterprises Educational Corporation, 1967.