According to Humphrey

1 The World According to Humphrey (2004)
2 Friendship According to Humphrey (2005)
3 Trouble According to Humphrey (2007)
4 Surprises According to Humphrey (2008)
5 Adventure According to Humphrey (2008)
More Adventures According to Humphrey (2009)
6 Summer According to Humphrey (2009)
Holidays According to Humphrey (2010)
7 School According to Humphrey (2011)
     aka School Days According to Humphrey
Humphrey's World of Pets (2011)
8 Mysteries According to Humphrey (2012)
9 Winter According to Humphrey (2012)
     aka Christmas According to Humphrey
Humphrey's Book of Summer Fun (2013)
10 Secrets According to Humphrey (2014)
11 Imagination According to Humphrey (2015)
12 Spring According to Humphrey (2016)
Humphrey's Mixed-Up Magic Trick (2016)
13 Happiness According to Humphrey (2024)

Humphrey's Big-Big-Big Book of Stories (2009)
Humphreys Book of Fun-Fun-Fun (2010)
Humphrey's Great-Great-Great Book of Stories (2010)
Humphrey's Ha-Ha-Ha Joke Book (2011)
Humphrey's Book of Christmas Fun (2013)
Humphrey's Ho-Ho-Ho Book of Stories (2013)

The Best Gift Set Ever (2011)