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<http://webisa.webdatacommons.org/prov/140309716>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/337419195> .
<http://webisa.webdatacommons.org/337419195>	<http://www.w3.org/ns/prov#value>	"Yet it is not without controversy and is a subject that students can often find particularly perplexing." .
<http://webisa.webdatacommons.org/337419195>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<atomicbooks.com> .