APA (7th ed.) Citation

Ellsworth, D., & Abeles, T. (1981). Methane production for your farm. i/e associates.

Chicago Style (17th ed.) Citation

Ellsworth, David, and Tom Abeles. Methane Production for Your Farm. Minneapolis, Minn.: i/e associates, 1981.

MLA (9th ed.) Citation

Ellsworth, David, and Tom Abeles. Methane Production for Your Farm. i/e associates, 1981.