https://www.mendhamboro.org/cms/lib02/NJ01000391-Centricity /Domain/220/reading%20strategies.pdf
https://www.nbss.ie/sites-default/files-publications-bookmarks_0.pdf
http://www.readingrockets.org/pdfs/edextras-40745-en.pdf
https://www.computer.org/csdl/mags/ex/2006-03-x3074.pdf
https://elt.oup.com/student/solutions/int-grammar/grammar_05_012e?cc=global&selLanguage=en