A primary source is defined as "a document or record containing firsthand information or original data on a topic, used in preparing a derivative work. Primary sources include original manuscripts, periodical articles reporting original research or thought, diaries, memoirs, letters, journals, photographs, drawings, posters, film footage, sheet music, songs, interviews, government documents, public records, eyewitness accounts, newspaper clippings, etc." (Joan M. Reitz, Online Dictionary for Library and Information Science, https://www.abc-clio.com/ODLIS/odlis_p.aspx). What is or is not a primary source can perhaps be better understood by comparison with the definition of a secondary source: "any published or unpublished work that is one step removed from the original source, usually describing, summarizing, analyzing, evaluating, derived from, or based on primary source materials, for example, a review, critical analysis, second-person account, or biographical or historical study. Also refers to material other than primary sources used in the preparation of a written work" (Reitz, https://www.abc-clio.com/ODLIS/odlis_s.aspx).
Wilson Center Digital Archive "International History Declassified" - Constructed and maintained by the Wilson Center’s History and Public Policy Program, the Digital Archive contains newly declassified historical materials from archives around the world—much of it in translation and including diplomatic cables, high level correspondence, meeting minutes and more.
Bandung Conference documents - The 1955 Bandung conference was one of the most important conferences held in the twentieth century. It’s also one of the least well known. Leaders of the major independent Asian and African countries gathered at this Indonesian city from April 18-22, 1955. There, they first set in motion the concept of South-South solidarity — newly-independent countries of Africa and Asia gathering to seek common ground. This e-dossier tells the story of the Bandung conference through the conference bulletin and additional documents. The African-Asian Conference Bulletin was published in the lead-up and aftermath to the conference and on a daily basis while the conference was going on. It was produced by a conference secretariat staff and published by the Indonesian ministry of information.