Παραπομπή APA

Livio, M., & Koekemoer, A. (2011). Black holes: Proceedings of the space telescope science institute symposium. Cambridge.

Παραπομπή Chicago Style

Livio, Mario., και Anton Koekemoer. Black Holes: Proceedings of the Space Telescope Science Institute Symposium. Cambridge: Cambridge, 2011.

Παραπομπή MLA

Livio, Mario., και Anton Koekemoer. Black Holes: Proceedings of the Space Telescope Science Institute Symposium. Cambridge, 2011.