National Research Council (U.S.). Astronomy and Astrophysics Survey Committee & Bahcall, J. N. (1991). Working papers: Astronomy and astrophysics panel reports. National Academy Press.
Dyfyniad Arddull ChicagoNational Research Council (U.S.). Astronomy and Astrophysics Survey Committee and John N. Bahcall. Working Papers: Astronomy and Astrophysics Panel Reports. Washington, D.C.: National Academy Press, 1991.
Dyfyniad MLANational Research Council (U.S.). Astronomy and Astrophysics Survey Committee and John N. Bahcall. Working Papers: Astronomy and Astrophysics Panel Reports. National Academy Press, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.