nuevas direcciones

http://links.jstor.org/sici?sici=0039-8322(197609)10%3A3%3C321%3APCPFIA%3E2.0.CO%3B2-M

http://links.jstor.org/sici?sici=0042-062X(197921)12%3A1%3C24%3ACCAPA%3E2.0.CO%3

http://www.eric.ed.gov/ERICWebPortal/custom/portlets/recordDetails/detailmini.jsp?_nfpb=true&_&ERICExtSearch_SearchValue_0=EJ635128&ERICExtSearch_SearchType_0=no&accno=EJ635128

http://www.eric.ed.gov/ERICWebPortal/custom/portlets/recordDetails/detailmini.jsp?_nfpb=true&_&ERICExtSearch_SearchValue_0=EJ337654&ERICExtSearch_SearchType_0=no&accno=EJ337654

http://www2.ups.edu/faculty/dkelley/compcorrcode.doc

http://www.usip.edu/writing/handouts/wc/WC43-WritersCompositionCorrectionSheet.pdf

http://www.pass-english-exams.com/en/correction/index.php