(1991). Dinosauring. Houghton Mifflin.
Dyfyniad Arddull ChicagoDinosauring. Atlanta: Houghton Mifflin, 1991.
Dyfyniad MLADinosauring. Houghton Mifflin, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
(1991). Dinosauring. Houghton Mifflin.
Dyfyniad Arddull ChicagoDinosauring. Atlanta: Houghton Mifflin, 1991.
Dyfyniad MLADinosauring. Houghton Mifflin, 1991.