Haarsma, P J
Chronological Checklist
- The Softwire: Virus on Orbis 1 (Cambridge, Massachusetts: Candlewick Press, 2006)
- The Softwire: Betrayal on Orbis 2 (Cambridge, Massachusetts: Candlewick Press, 2008)
- The Softwire: Wormhole Pirates on Orbis 3 (Cambridge, Massachusetts: Candlewick Press, 2009)
- The Softwire: Awakening on Orbis 4 (Cambridge, Massachusetts: Candlewick Press, 2010)