APA (7th ed.) Citation

Stegeman, J. R. (1991). Improved asphalts with supercritical extraction. [publisher not identified].

Chicago Style (17th ed.) Citation

Stegeman, James Raymond. Improved Asphalts with Supercritical Extraction. [Place of publication not identified]: [publisher not identified], 1991.

MLA (9th ed.) Citation

Stegeman, James Raymond. Improved Asphalts with Supercritical Extraction. [publisher not identified], 1991.

Warning: These citations may not always be 100% accurate.