http://www.autoenglish.org/basic/gr.posadpro.i.htm
http://www.learnenglishfeelgood.com/esl-possessive-pronouns1.html
http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/poss1.htm DOBRO PREBERI NAVODILA in glej primer
http://www.saberingles.com.ar/exercises/150.html