Cita APA (7a ed.)

Fernandez, J. A., & Jockers, K. (1982). Nature and origin of comets. Max-Planck-Instut fur aeronomie.

Cita Chicago Style (17a ed.)

Fernandez, Julio A., y K. Jockers. Nature and Origin of Comets. Bonn: Max-Planck-Instut fur aeronomie, 1982.

Cita MLA (9a ed.)

Fernandez, Julio A., y K. Jockers. Nature and Origin of Comets. Max-Planck-Instut fur aeronomie, 1982.