Gaya APA

Powell, W, B, &, W. (1979). Efficient Comfort Conditioning, The Heating and Cooling of Buildings (--). United States of America: American Library Association.

Gaya MLA

Powell, Wilter, Berl, &, W.Richard. "Efficient Comfort Conditioning, The Heating and Cooling of Buildings". -- United States of America: American Library Association, 1979. Text.