11 books in series

According to Humphrey

According to Humphrey is a 9-book series with 11 primary works first released in 2004 with contributions by Betty G. Birney.

The World According to Humphrey
Friendship According to Humphrey
Trouble According to Humphrey
Surprises according to Humphrey
Adventure According to Humphrey
Summer According to Humphrey
School Days According to Humphrey
Mysteries According to Humphrey
Winter according to Humphrey
Secrets According to Humphrey
Imagination According to Humphrey