Cita APA (7a ed.)
Ola, P., & d'Aulaire, E. (Jun95). Freight trains are back and they're on a roll. Smithsonian, 26(3), 36-47.
Cita Chicago Style (17a ed.)
Ola, Per, y Emily d'Aulaire. "Freight Trains Are Back and They're on a Roll." Smithsonian 26, no. 3 (Jun95): 36-47.
Cita MLA (9a ed.)
Ola, Per, y Emily d'Aulaire. "Freight Trains Are Back and They're on a Roll." Smithsonian, vol. 26, no. 3, Jun95, pp. 36-47.
Precaución: Estas citas no son 100% exactas.