Vasquez, J., Cappa, C. E., & Pineault, S. (2009). Multifrequency study of the ring nebula SG 13.
Cita Chicago Style (17a ed.)Vasquez, Javier, Cristina Elisabet Cappa, y Serge Pineault. Multifrequency Study of the Ring Nebula SG 13. 2009.
Cita MLA (8a ed.)Vasquez, Javier, et al. Multifrequency Study of the Ring Nebula SG 13. 2009.
Precaución: Estas citas no son 100% exactas.