most sources seem to be paywalled.. I am not an expert on this subject.
http://psycnet.apa.org/buy/1992-08554-001
thf_media.s3.amazonaws.com/familyfacts/briefs/FF_Brief_43.pdf
http://psycnet.apa.org/buy/1992-08554-001
thf_media.s3.amazonaws.com/familyfacts/briefs/FF_Brief_43.pdf