What primary purpose does a citation serve in a work of history

Why was the tea tax seen as a reprehensible to the people of boston ?

Need ! how did sumner define liberty in the book of "voices of freedom"

Match the artists with his technique or to his work. 1 . michelangelo the illusion of depth 2 . giotto perspective and chiaroscuro 3 . raphael "the last supper" 4 . velazquez "sistine madonna" 5 . holbein "david" 6 . masaccio portrait of henry viii 7 . van eyck flemish painter 8 . da vinci spanish painter