APA (7th ed.) Zitazioa

(1993). Trace elements in coal and coal combustion residues. Lewis.

Chicago Style (17th ed.) Zitazioa

Trace Elements in Coal and Coal Combustion Residues. Boca Raton: Lewis, 1993.

MLA (9th ed.) Zitazioa

Trace Elements in Coal and Coal Combustion Residues. Lewis, 1993.