Dyfyniad APA

Preston, R. (1982). Teaching world understanding. Prentice-Hall.

Dyfyniad Arddull Chicago

Preston, Ralph. Teaching World Understanding. New yark: Prentice-Hall, 1982.

Dyfyniad MLA

Preston, Ralph. Teaching World Understanding. Prentice-Hall, 1982.

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