A. primary source documents
An interview with the French ambassador about diplomacy in France would be considered a secondary source.
You would consult a primary source for a first and personal view of an historical event. Primary sources are original materials.
interview of Vietnam veteran
A television programme or a live interview would be an example of a non-written source.
An interview with a witness to a historical event would be the best example of a primary source, as it provides firsthand information from someone who experienced the event.
The readers guide to periodical literature
The most reliable source on topography in the United States is the U.S. Geological Survey.
It will be your fitness or gym trainer.
to corroborate a given primary source's claim about an event
A 19 year old in the United States is considered an adult. As such, it would be their decision as to whether or not you could sit in on a consult with an attorney. Without their consent, a lawyer is unlikely to allow you to sit in on a consult or interview, as you are not a party to the case.
A suit would be best for an interview.