APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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