APA Style
Curwen, Peter, Thayer, Robert L.. ().
Gray world- green heart .
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Chicago Style
Curwen, Peter, Thayer, Robert L..
Gray world- green heart.
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,
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.
MLA Style
Curwen, Peter, Thayer, Robert L..
Gray world- green heart.
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,
.
.
Turabian Style
Curwen, Peter, Thayer, Robert L..
Gray world- green heart.
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,
.
.