Well, this deck has no book that corresponds to it. It does come with a Little White Book inside the box that you can use, if you chose. However, the meanings are standard Golden Dawn (Rider Waite Smith) imagery, and I find the LWB doesn't address the cards' actual illustrations to my liking.
The Pollack and the Bunning books are very good ones, I'm sure - they are both well respected, notable Tarot authors who can give you a basis of standardized Tarot meanings to memorize, if you prefer. But, they use Rider Waite cards, and discuss the imagery from Rider Waite decks, in these books. And this is, of course, no Rider Waite. It's the Gothic.
You can still learn the meanings of cards from books like these, and find correlations to what you see when you read the Gothic deck. One is not mutually exclusive of the other, but the books you mention will not help you to read *this* deck.
No book out there, yet, will help you there.
I find reading a deck with no book to fall back on can push you to expand your abilities, because *there is no wrong answer*!!!
When you gaze at the Empress card one day, she may look like she's a Goddess who's been disturbed too soon (and then you may consider how this intuitive message *suggested to you by the illustration alone* interacts with your reading and your question). Another day, she may look pleasantly surprised to see you. How then does that seem to fit the context of your reading, I ask myself. There is no singular "right" answer, which may feel disorienting at first, I know.
For me, I practice with the deck often to get to know it. If you aren't comfortable doing long readings with it right away, try pulling a single card a day and see what it suggests to you, as well as how the card may present itself in the course of your day. (And then come share that with us, if you like, on the Vargo Gothic daily card thread!)
I continue to insist that Monolith Graphics would do well if they ever released a fullout companion book to their deck.
It's been mentioned by others in this forum before. A girl can wish....