แหล่งที่มา WikiPedia: สถานะเพศ http://61.7.150.131:1200/km/index.php?option=com_c... http://www.oeb.harvard.edu/faculty/haig/publicatio... http://people.virginia.edu/~ser6f/udry.pdf //www.ncbi.nlm.nih.gov/pubmed/15146141 //www.ncbi.nlm.nih.gov/pubmed/7890091 http://apps.who.int/gender/whatisgender/en/ http://www.teenpath.net/data/event/40003/Teen01/co... //doi.org/10.1023%2FB:ASEB.0000014323.56281.0d //doi.org/10.2307%2F2061790 //www.jstor.org/stable/2061790
