Norby Chronicles

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)

The Norby Chronicles (1986) (with Isaac Asimov)
Norby and the Court Jester / Norby and the Terrified Taxi (2024) (with Isaac Asimov)
Norby and the Invaders / Norby and the Queen's Necklace (2024) (with Isaac Asimov)