It depends on the field.
In an intro to physics course, I've cited the Principia before without issues.
I've also cited the Cyropaedia in a philosophy course.
I got a significant penalty for citing a 2013 article for a software design paper.
It depends on the field.
In an intro to physics course, I've cited the Principia before without issues.
I've also cited the Cyropaedia in a philosophy course.
I got a significant penalty for citing a 2013 article for a software design paper.