(1976). Psychological research. Harper & Row.
Dyfyniad Arddull ChicagoPsychological Research. Harper & Row, 1976.
Dyfyniad MLAPsychological Research. Harper & Row, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
(1976). Psychological research. Harper & Row.
Dyfyniad Arddull ChicagoPsychological Research. Harper & Row, 1976.
Dyfyniad MLAPsychological Research. Harper & Row, 1976.