Dyfyniad APA

Grattan, E. (1981). Seat-belt legislation and after.

Dyfyniad Arddull Chicago

Grattan, E. Seat-belt Legislation and After. 1981.

Dyfyniad MLA

Grattan, E. Seat-belt Legislation and After. 1981.

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