rifkin 's references are ... impeccable throughout . 
(ROOT (S (NP (NP (NNP rifkin) (POS 's)) (NNS references)) (VP (VBP are) (, ...) (ADJP (JJ impeccable)) (ADVP (IN throughout))) (. .)))
(ROOT (S (NP (NP (NNP ) (POS )) (NNS )) (VP (VBP ) (, ) (ADJP (JJ )) (ADVP (IN ))) (. )))