### Clue: Thence reference is included in an article on memory (9)
### Answer: THEREFROM 
 ### Explanation: Definition: Thence
 REF(abbrev. for "reference") **contained in**(is included in) [ THE(the definite article in grammar) **placed above**(on, in a down clue) ROM(abbrev. for "read only memory" in a computer system) ].