David Jolly. (1996). Writing Tasks. Đồng Nai: Đồng Nai.
Dyfyniad Arddull ChicagoDavid Jolly. Writing Tasks. Đồng Nai: Đồng Nai, 1996.
Dyfyniad MLADavid Jolly. Writing Tasks. Đồng Nai: Đồng Nai, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.