1. PRYMARI CUDOMTENS are first-hand documents written by those who experience and/or see it at the period of research or time an event happens. 2. SEONCARDY DENCUOMTS are documents written as recount of events. 3. Sources providing answers to questions such as statistics, maps, background information, (re)directing to additional sources are RENCEREFE TEIAMARLS. 4. EENFEESCFTIVS refers to the degree of being able to achieve the desired result based from their objective or purpose. 5. It is essential to review the sources of information for the readers to avold PIRSAGILIAM.​