Dyfyniad APA
KREITLER, S., & ET AL. (1990). RIGIDITY IN MENTALLY RETARDED AND NONRETARDED CHILDREN.
Dyfyniad Arddull Chicago
KREITLER, S., and ET AL. RIGIDITY IN MENTALLY RETARDED AND NONRETARDED CHILDREN. 1990.
Dyfyniad MLA
KREITLER, S., and ET AL. RIGIDITY IN MENTALLY RETARDED AND NONRETARDED CHILDREN. 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.