Cita APA (7a ed.)

Symposium on Recent Advances in Observational Astronomy, Johnson, H. L., & Allen, C. (1981). Recent advances in observational astronomy: III Symposium. Universidad Nacional Autónoma de México.

Cita Chicago Style (17a ed.)

Symposium on Recent Advances in Observational Astronomy, Harold L. Johnson, y Christine Allen. Recent Advances in Observational Astronomy: III Symposium. México: Universidad Nacional Autónoma de México, 1981.

Cita MLA (9a ed.)

Symposium on Recent Advances in Observational Astronomy, et al. Recent Advances in Observational Astronomy: III Symposium. Universidad Nacional Autónoma de México, 1981.