Cita APA (7a ed.)

Khachikian, E., Fricke, K., & Melnick, J. (1987). Observational Evidence of Activity in Galaxies. Reidel ublishing Company.

Cita Chicago Style (17a ed.)

Khachikian, E.Y, K.J Fricke, y J. Melnick. Observational Evidence of Activity in Galaxies. Dordrecht: Reidel ublishing Company, 1987.

Cita MLA (9a ed.)

Khachikian, E.Y, et al. Observational Evidence of Activity in Galaxies. Reidel ublishing Company, 1987.