Possessive adjectives and posessive 's

http://learnenglish.britishcouncil.org/en/english-grammar/possessives/possessives-nouns

http://members.iinet.net.au/~adelegc/grammar/possessive_adjectives/possessiveadjectives.html

http://www.sewanee.edu/Language_Lab/spanish/possde.html

http://a4esl.org/q/f/z/zz18mdf.htm

http://www.myenglishgrammar.com/english/exercise-10-possession.html

http://elblogdelingles.blogspot.com/2007/02/lesson-36-genitive-el-genitivo-sajn.html

http://www.theyellowpencil.com/gramagenitivo.html

http://manuelbarbado1.blogspot.com/2008/10/unit-2-practice-genitivo-sajn.html