Cita APA (7a ed.)

Liu, L., Qian, S. B., & Fernández Lajús, E. (2011). Two extreme contact binary systems in the nearest globular cluster M4.

Cita Chicago Style (17a ed.)

Liu, L., S. B. Qian, y Eduardo Fernández Lajús. Two Extreme Contact Binary Systems in the Nearest Globular Cluster M4. 2011.

Cita MLA (8a ed.)

Liu, L., et al. Two Extreme Contact Binary Systems in the Nearest Globular Cluster M4. 2011.