Williams, T. R. (2011). Advancing variable star astronomy: The centennial history of the American association of variable star observers. Cambridge University.
Dyfyniad Arddull ChicagoWilliams, Thomas R. Advancing Variable Star Astronomy: The Centennial History of the American Association of Variable Star Observers. Cambridge: Cambridge University, 2011.
Dyfyniad MLAWilliams, Thomas R. Advancing Variable Star Astronomy: The Centennial History of the American Association of Variable Star Observers. Cambridge University, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.