Cita APA (7a ed.)
Jackson, D. (May89). When 20 million tons of water flooded Johnstown. Smithsonian, 20(2), 50-62.
Cita Chicago Style (17a ed.)
Jackson, D.D. "When 20 Million Tons of Water Flooded Johnstown." Smithsonian 20, no. 2 (May89): 50-62.
Cita MLA (9a ed.)
Jackson, D.D. "When 20 Million Tons of Water Flooded Johnstown." Smithsonian, vol. 20, no. 2, May89, pp. 50-62.
Precaución: Estas citas no son 100% exactas.