We found 2 dictionaries that define the word reference numbers:

General (1 matching dictionary)

1. reference numbers: Collins English Dictionary

Art (1 matching dictionary)

2. Glossary of Stamp Collecting Terms (No longer online)

▸ Words similar to reference numbers ▸ Usage examples for reference numbers ▸ Idioms related to reference numbers ▸ Wikipedia articles (New!) ▸ Words that often appear near reference numbers ▸ Rhymes of reference numbers ▸ Invented words related to reference numbers