Don't Publish a Nonfiction Book without an Index - Write Nonfiction NOW!
How to DIY a Nonfiction Index (Part One) — The Self-Publishing Advice Center
How To Publish A Book
How to Index Non-Fiction
Non-fiction Services to Schools
Big Fiction: How Conglomeration Changed the Publishing Industry and American Literature by Dan Sinykin
Indexing Information for Self-Publishers —
Choosing Book Index Software & Options for your nonfiction paperback – Birds of a Feather
Free Nonfiction Book Outline Template
How to Write a Nonfiction Book (8 Key Stages) - Learn Squibler
How to Make a (Really Good) Book Index in Word - TCK Publishing
How to Index Non-Fiction
Do you only write non-fiction? - Quora
Write Useful Books: A modern approach to designing and refining recommendable nonfiction by Rob Fitzpatrick
Nonfiction Books To Read If You Don't Really Read Nonfiction