APA (7th ed.) Citation

Keeler, G. J., & Samson, P. J. (1989). Spatial representativeness of trace element ratios. Environmental Science & Technology, 23, 1358. https://doi.org/10.1021/es00069a005

Chicago Style (17th ed.) Citation

Keeler, Gerald J., and Perry J. Samson. "Spatial Representativeness of Trace Element Ratios." Environmental Science & Technology 23 (1989): 1358. https://doi.org/10.1021/es00069a005.

MLA (9th ed.) Citation

Keeler, Gerald J., and Perry J. Samson. "Spatial Representativeness of Trace Element Ratios." Environmental Science & Technology, vol. 23, 1989, p. 1358, https://doi.org/10.1021/es00069a005.