The Humphrey Audio Collection, Books 8-11: Mysteries According to Humphrey; Winter According to Humphrey; Secrets Accordingto Humphrey; Imagination According to Humphrey (Unabridged)
2015
The World According to Humphrey (Unabridged)
2018
The Humphrey Audio Collection, Books 1-3: The World According to Humphrey; Friendship According to Humphrey; and Trouble According to Humphrey (Unabridged)
2024
The Humphrey Audio Collection, Books 4-7: Surprises According to Humphrey; Adventure According to Humphrey; Summer According to Humphrey; and School Days According to Humphrey (Unabridged)
2024
School Days According to Humphrey (Unabridged)
2011
Surprises According to Humphrey (Unabridged)
2018