Billings, B. R. (1941). Nitrous Oxide for Dental Anaesthesia.
Chicago Style CitationBillings, B. Richardson. Nitrous Oxide for Dental Anaesthesia. 1941.
Cita MLABillings, B. Richardson. Nitrous Oxide for Dental Anaesthesia. 1941.
Atenció: Aquestes cites poden no estar 100% correctes.