Who or what would be considered a reliable primary source on the subject of directing a hollywood movie?
a.
a textbook on directing
b.
director steven spielburg
c.
the internet
d.
a college student studying film making

A textbook on directing sounds the most informative

The name may be in importnce  to them

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!