Cita APA (7th ed.)

American Chemical Society. Division of Industrial and Engineering Chemistry, Gaffney, J. S., Marley, N. A., & Clark, S. B. (1996). Humic and fulvic acids: Isolation, structure, and environmental role. American Chemical Society.

Cita Chicago (17th ed.)

American Chemical Society. Division of Industrial and Engineering Chemistry, Jeffrey S. Gaffney, Nancy A. Marley, i Sue B. Clark. Humic and Fulvic Acids: Isolation, Structure, and Environmental Role. Washington, DC: American Chemical Society, 1996.

Cita MLA (9th ed.)

American Chemical Society. Division of Industrial and Engineering Chemistry, et al. Humic and Fulvic Acids: Isolation, Structure, and Environmental Role. American Chemical Society, 1996.