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Gospel of Thomas is a basic one, also read the entire wiki entry on gnosticism.
I am also aware of the "The Cult of the Black Cube: A Saturnian Grimoire" which i'm not sure if it is exactly gnosticism, but dwells on Saturn, which is attribuited to Yaldabaoth
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Thomas Hoeller Gnosticism is a great start, also St Irineus of Lyon "Against heresies" for a refutation from a christian orthodox perspective

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Here's a list of bonafide Gnostic movies which are a nice starting point:
>The Matrix
>The Truman Show
>All Darren Aronofsky movies (Mother! in particular)
>Donnie Darko
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