Cita APA

Cowley, C. R., Hubrig, S., Castelli, F., Gonzalez, J. F., & Wolff, B. (2007). Heavy calcium in CP stars. Web

Citación estilo Chicago

Cowley, C. R., S. Hubrig, F. Castelli, Jorge Federico Gonzalez, and B. Wolff. Heavy Calcium in CP Stars. 2007.

Cita MLA

Cowley, C. R., et al. Heavy Calcium in CP Stars. 2007.