Dyfyniad APA

Billings, J. S. (1893). Ventilation and heating. The Engineering record.

Dyfyniad Arddull Chicago

Billings, John S. Ventilation and Heating. New York: The Engineering record, 1893.

Dyfyniad MLA

Billings, John S. Ventilation and Heating. The Engineering record, 1893.

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