APA (7th ed.) Citation

Pool, T. A. (1984). An automatic guidance system for tractors with open-center hydraulics. [publisher not identified].

Chicago Style (17th ed.) Citation

Pool, Thomas Alan. An Automatic Guidance System for Tractors with Open-center Hydraulics. [Place of publication not identified]: [publisher not identified], 1984.

MLA (9th ed.) Citation

Pool, Thomas Alan. An Automatic Guidance System for Tractors with Open-center Hydraulics. [publisher not identified], 1984.