Beatty, L. F. (1981). Still pictures. Educational Technology Publications.
Dyfyniad Arddull ChicagoBeatty, LaMond F. Still Pictures. Englewood Cliffs, N.J.: Educational Technology Publications, 1981.
Dyfyniad MLABeatty, LaMond F. Still Pictures. Educational Technology Publications, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.