Cita APA (7a ed.)

Portwood, M. E., & Portwood, T. B. (1977). Our nation's story. Steck-Vaughn.

Cita Chicago Style (17a ed.)

Portwood, Mary E., y Thomas B. Portwood. Our Nation's Story. Austin: Steck-Vaughn, 1977.

Cita MLA (8a ed.)

Portwood, Mary E., y Thomas B. Portwood. Our Nation's Story. Steck-Vaughn, 1977.