What is Reddit's opinion of The Easy Way to Write Horror That Sells?

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The books I'm using are:

1. The Easy Way to Write Horror That Sells by Rob Parnell

2. Writing Dark Stories: How to Write Horror and Other Disturbing Short Stories (Writer's Craft Book 6) by Rayne Hall

3. Writing Scary Scenes: Professional Techniques for Thrillers, Horror and Other Exciting Fiction (Writer's Craft Book 2) by Rayne Hall

4. On Writing Horror: A Handbook by the Horror Writers Association by Mort Castle et al.

5. Mini Horror Fiction Writing Guide: 7 Steps To Writing Horror Fiction For Fun by Randal Schaffer, HowExpert Press

6. Horror Writing 101: How to Write a Horror Novel by Steve French

7. Writers Workshop of Horror by Michael Knost et al.

Anybody have any other book recommendations while we're at it?

Note: none of these links are affiliate links.

Edit: formatting