(S (S (BASENP (NNS Instructions)) (VP (VBP indicate) (SBAR (S (BASENP (JJ such) (NNS books)) (VP (MD must) (VP (VB be) (VP (VBN returned) (PP (TO to) (BASENP (DT the) (NN source) (CC or) (NN donor)))))))))) (PERIOD .))