Cita APA (7th ed.)
(1954). Minerals Yearbook: 1952, fuels = Vol. 2. United States Gov.Pr.Off.
Cita Chicago (17th ed.)
Minerals Yearbook: 1952, Fuels = Vol. 2. Washington: United States Gov.Pr.Off, 1954.
Cita MLA (9th ed.)
Minerals Yearbook: 1952, Fuels = Vol. 2. United States Gov.Pr.Off, 1954.
Atenció: Aquestes cites poden no estar 100% correctes.