"the Italian beginning of the Renaissance"
"Jupiter was the origin of the radiation"
"Pittsburgh is the source of the Ohio River"
"communism's Russian root"
"the reporter had two sources for the story"
"he was the generator of several complaints"
"a heat source"
"a source of carbon dioxide"
"an infectious agent depends on a reservoir for its survival"
"he carried an armful of references back to his desk"
"he spent hours looking for the source of that quotation"
"She sourced a supply of carpet"
"They are sourcing from smaller companies"
"The writer carefully sourced her report"
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