Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.