APA (7th ed.) Citation

Allen, M. B. (1987). An opposed-bucket lunar digging implement. Dataplex Information Services.

Chicago Style (17th ed.) Citation

Allen, Marshall B. An Opposed-bucket Lunar Digging Implement. Houston, Tex.: Dataplex Information Services, 1987.

MLA (9th ed.) Citation

Allen, Marshall B. An Opposed-bucket Lunar Digging Implement. Dataplex Information Services, 1987.