APA (7th ed.) Citation

Helton, T. E. (1986). A solvent study of the direct liquefaction of Big Brown lignite. [publisher not identified].

Chicago Style (17th ed.) Citation

Helton, Terry Eugene. A Solvent Study of the Direct Liquefaction of Big Brown Lignite. [Place of publication not identified]: [publisher not identified], 1986.

MLA (9th ed.) Citation

Helton, Terry Eugene. A Solvent Study of the Direct Liquefaction of Big Brown Lignite. [publisher not identified], 1986.