APA (7th ed.) Zitazioa
Wilson, P. J., & Wells, J. H. (1950). Coal, coke, and coal chemicals. McGraw-Hill.
Chicago Style (17th ed.) Zitazioa
Wilson, Philip J., eta Joseph H. Wells. Coal, Coke, and Coal Chemicals. Nueva York, EUA: McGraw-Hill, 1950.
MLA (9th ed.) Zitazioa
Wilson, Philip J., eta Joseph H. Wells. Coal, Coke, and Coal Chemicals. McGraw-Hill, 1950.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.