The five common sources of information are:

• Radio
• Television
• Internet
• Printed media (such as newspapers or magazines)
• Direct communication (talking to people or conducting interviews)

These sources provide a wealth of knowledge and are frequently used by media researchers for gathering information and media planning

. Additionally, information sources can be broadly categorized as:

• Primary sources: Original materials or first-hand accounts (e.g., diaries, interviews, original documents)
• Secondary sources: Interpretations or analyses of primary sources (e.g., journal articles, textbooks)
• Tertiary sources: Summaries or compilations of primary and secondary sources (e.g., encyclopedias, indexes)

However, the five sources listed above (radio, television, internet, printed media, and interviews) are the typical practical categories used especially in media research contexts