Avoid being vague If you have references include them. Dont say available upon request. If you have gaps in employment explain them clearly. They will probably come up in the interview anyways. Being prepared in advance by giving complete information in your resume is better than being caught off guard in the interview or worse skipped over all together.
Always include a cover letter The cover letter is your time to highlight your skills and sell yourself as well as your resume to the recruiter. Make sure to use power statements and highlight your best qualities to get their attention. Your cover letter should address all the requirements for the position and explain why youre the best person for the job.
Combination resume is the combination of above two formats. It is getting popular these days as it includes the features of above resume formats. Just like the resume formats, there are different types of resume samples. Combination, functional and chronological are the three main types in which samples are provided on most online websites.