PEIRCE, W. S. Economics Of The Energy Industries William Spangar Peirce. s.n.
Lua i Stíl Chicago (17ú heag.)PEIRCE, William Spangar. Economics Of The Energy Industries William Spangar Peirce. s.n.
Lua MLA (8ú heag.)PEIRCE, William Spangar. Economics Of The Energy Industries William Spangar Peirce. s.n.
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