| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Where Do Babies Come from: 002 | 978-0-570-03553-4 (0-570-03553-8) | 1995 | Hummel Ruth |
| Where Do Babies Come From?: For Ages 6 to 8 and Parents | 978-0-570-03563-3 (0-570-03563-5) | 1998 | |
R. H. · R Hummel · R. S. · R S H · Ruth Hummel · S H · S. Hummel