The Purdue University OWL (Online Writing Lab) offers free citation style guides and examples of citations for most citation styles.
AMA:
Alonso, A, Camargo, JA. Toxicity of nitrite to three species of freshwater invertebrates. Environmental Toxicology. 2006;21(1), 90-94. https://doi.org/10.1002/tox.20155. Accessed May 26, 2009.
APA:
Alonso, A., & Camargo, J. A. (2006). Toxicity of nitrite to three species of freshwater invertebrates. Environmental Toxicology, 21(1), 90-94. https://doi.org/10.1002/tox.20155
MLA:
Alonso, Alvaro, and Julio A. Camargo. “Toxicity of Nitrite to Three Species of Freshwater Invertebrates.” Environmental Toxicology, vol. 21, no. 1, 3 Feb. 2006, pp. 90-94. Wiley Online Library, https://doi.org/10.1002/tox.20155. Accessed 26 May 2009.