Joe Bergin Michael J. Clancy Don Slater Michael Goldweber David B. Levine Day one of the objects-first first course: what to do. 264-265 2007 conf/sigcse/2007 SIGCSE http://doi.acm.org/10.1145/1227310.1227404 db/conf/sigcse/sigcse2007.html#BerginCSGL07