Norby
1 Norby, the Mixed-up Robot (1983) (with Isaac Asimov)
2 Norby's Other Secret (1984) (with Isaac Asimov)
3 Norby and the Lost Princess (1985) (with Isaac Asimov)
4 Norby and the Invaders (1985) (with Isaac Asimov)
5 Norby and the Queen's Necklace (1986) (with Isaac Asimov)
6 Norby Finds a Villain (1987) (with Isaac Asimov)
Robot for Hire (1987) (with Isaac Asimov)
Norby Through Time and Space (1988) (with Isaac Asimov)
7 Norby Down to Earth (1989) (with Isaac Asimov)
8 Norby and Yobo's Great Adventure (1989) (with Isaac Asimov)
9 Norby and the Oldest Dragon (1990) (with Isaac Asimov)
10 Norby and the Court Jester (1991) (with Isaac Asimov)
11 Norby and the Terrified Taxi (1997)
2 Norby's Other Secret (1984) (with Isaac Asimov)
3 Norby and the Lost Princess (1985) (with Isaac Asimov)
4 Norby and the Invaders (1985) (with Isaac Asimov)
5 Norby and the Queen's Necklace (1986) (with Isaac Asimov)
6 Norby Finds a Villain (1987) (with Isaac Asimov)
Robot for Hire (1987) (with Isaac Asimov)
Norby Through Time and Space (1988) (with Isaac Asimov)
7 Norby Down to Earth (1989) (with Isaac Asimov)
8 Norby and Yobo's Great Adventure (1989) (with Isaac Asimov)
9 Norby and the Oldest Dragon (1990) (with Isaac Asimov)
10 Norby and the Court Jester (1991) (with Isaac Asimov)
11 Norby and the Terrified Taxi (1997)