Cita APA (7th ed.)

Allard, B., Borén, H., & Grimvall, A. (1991). Humic substances in the aquatic and terrestrial environment: Proceedings of an international symposium, Linköping, Sweden, August 21-23, 1989. Springer-Verlag.

Cita Chicago (17th ed.)

Allard, Bert, Hans Borén, i Anders Grimvall. Humic Substances in the Aquatic and Terrestrial Environment: Proceedings of an International Symposium, Linköping, Sweden, August 21-23, 1989. Berlin ; New York: Springer-Verlag, 1991.

Cita MLA (9th ed.)

Allard, Bert, et al. Humic Substances in the Aquatic and Terrestrial Environment: Proceedings of an International Symposium, Linköping, Sweden, August 21-23, 1989. Springer-Verlag, 1991.