What are the key differences between citing a book in APA 6th and APA 7th style?

The key differences between citing a book in APA 6th and APA 7th style are the inclusion of up to 20 authors in APA 7th compared to only 7 in APA 6th, the use of "et al." for more than three authors in APA 7th, and the inclusion of the publisher location in APA 6th but not in APA 7th.