According to Humphrey (2007–2015)
- Trouble According to Humphrey (2007)
- Adventure According to Humphrey (2008)
- Surprises According to Humphrey (2008)
- Summer According to Humphrey (2010)
- School Days According to Humphrey (2011)
- Mysteries According to Humphrey (2012)
- Winter According to Humphrey (2012)
- Secrets According to Humphrey (2014)
- Imagination According to Humphrey (2015)