I'm aware of four books that have been written on Gambas. Notice that they all talk about the stable version.

	Gambas - Programacion Visual Con Software Libre A spanish book written by Daniel Campos & José Luis Redrejo, with a foreword by your servant. There is a translation in brazilian portuguese there.
	A Beginner's Guide To Gambas An american book written by John W. Rittinghouse.
	Menguasai Gambas - Pemrograman "Visual Basic" Di Linux It seems to be an indonesian book. Please confirm, I'm not sure!
	Gambas WikiBook A wiki book on Gambas, located at http://en.wikibooks.org/wiki/Gambas.