A, H. B., E, R. S., & J, R. T. (1990, July). Time and space variations of sulfur dioxide concentrations in the metropolitan area of Mexico City. Geofísica Internacional.
Chicago Style (17th ed.) CitationA, H. Bravo, R. Sosa E, and R. Torres J. "Time and Space Variations of Sulfur Dioxide Concentrations in the Metropolitan Area of Mexico City." Geofísica Internacional Jul. 1990.
MLA (9th ed.) CitationA, H. Bravo, et al. "Time and Space Variations of Sulfur Dioxide Concentrations in the Metropolitan Area of Mexico City." Geofísica Internacional, Jul. 1990.
Warning: These citations may not always be 100% accurate.