Information

Primary sources of Information

• Periodical
• Research Report
• Conference Proceedings
• Patents
• Standard
• Specifications
• Trade Literature
• Thesis

Secondary sources of Information

• Indexing Periodicals
• Abstracting Periodicals
• Review of Progress
• Treatises
• Reference Books
• Handbooks
• Textbooks

Tertiary sources of information

• Guides
• List of Research in progress
• Bibliography of Bibiographies

Non documentary sources of information

• Formal
• informal
• Noncoventional