In this week, we learn about primary, secondary and tertiary sources. Primary sources is an original document or a first hand information. For example, diaries, letters, journals, speeches, manuscripts, statistical data, interviews, photographs, audio or video recordings and research reports.
While, tertiary sources is collection of primary and secondary sources. For example, bibliographies of bibliography, directories of directories, and guides to the literature.
Besides that we also learn about information retrieval system which consist of Online Public Access Catalog (OPAC), databases, and the internet.