Cita APA (7a ed.)

Testori, J. C., Luna, H., & Colomb, F. R. (1987). Simultaneous observations in the optical and radio domain of the BL Lacertae objects: PKS 0521-36 and PKS 0537-441.

Cita Chicago Style (17a ed.)

Testori, Juan Carlos, H.G Luna, y Fernando Raúl Colomb. Simultaneous Observations in the Optical and Radio Domain of the BL Lacertae Objects: PKS 0521-36 and PKS 0537-441. 1987.

Cita MLA (8a ed.)

Testori, Juan Carlos, et al. Simultaneous Observations in the Optical and Radio Domain of the BL Lacertae Objects: PKS 0521-36 and PKS 0537-441. 1987.