The best advice I can offer is to know what kind of information employers are seeking in order to ensure your references are the most effective, in order to accomplish this you can:
- Be in contact with direct/indirect superiors for past positions in order to determine how active they're willing to be or act on your behalf.
- Explain to your reference what are the qualities or areas of expertise you'd like them to highlight (according to the qualities the employer is looking for).
- Provide as much information as possible regarding the position you're aiming for to your reference in order for them to be able to portray you in the best possible way.
B
Because it’s not a direct answer