Poland - diplomas, references, recommendation or proof of good conduct

Do I need to send diplomas with my application?

In some cases, copies of your certificates, diploma, etc. should be attached to your CV. Employers take these into consideration when deciding whether or not to invite you for an interview.

Should I supply references, letters of recommendation or proof of good conduct?

References are not commonly used. Instead, submit confirmation of your employment in written form and documents connected with your education. If you wish to submit references anyway, cite former employers or teachers as referees. You normally do not need letters of recommendation, although these can be helpful if written by a prominent employer. Jobs in the public sector require a statement that applicants have no criminal or tax offence record.