Save guides, add subjects and pick up where you left off with your BBC account. A secondary source is information written about an experiment, discovery, or topic that someone else investigated.

OPEC had already dropped in 2022 the International Energy Agency (IEA) from its list of secondary sources after the Paris-based agency embarked on a campaign to criticize oil-producing countries ...

The key is to be aware that there are two types of records — primary and secondary. Primary sources are most reliable because they were recorded at or close to the time that the event happened ...

Suggestions for adaptation include: include further primary and secondary sources for students to analyze (see Resources); assign students a side in the debate (pro or con) over Temperance and ...

OPEC+ uses secondary sources to help monitor its output as a legacy of historic OPEC disputes about how much oil members were pumping and occasionally alters the list. In March 2022, OPEC+ dropped ...