APA (7th ed.) Citation

Wright, D. S. (1984). Coal deposit characterization by gamma-gamma density/percent dry ash relationships. [publisher not identified].

Chicago Style (17th ed.) Citation

Wright, David Scott. Coal Deposit Characterization by Gamma-gamma Density/percent Dry Ash Relationships. [Place of publication not identified]: [publisher not identified], 1984.

MLA (9th ed.) Citation

Wright, David Scott. Coal Deposit Characterization by Gamma-gamma Density/percent Dry Ash Relationships. [publisher not identified], 1984.