APA (7th ed.) Citation

Gaddie Sr., R. E., & Douglas, D. E. (1977). Earthworms: For ecology and profit. Bookworm.

Chicago Style (17th ed.) Citation

Gaddie Sr., Ronald E., and Donald E. Douglas. Earthworms: For Ecology and Profit. Ontario, CA: Bookworm, 1977.

MLA (9th ed.) Citation

Gaddie Sr., Ronald E., and Donald E. Douglas. Earthworms: For Ecology and Profit. Bookworm, 1977.