APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (8:e uppl.)

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