Wikipedia:Articles for deletion/Joost de Valk (2nd nomination)
The ''Ultimate Guide to Link Building'' looks solid. It wasn't written by him and it has a reputable publisher. Combined with Business Insider and PC Magazine, I feel that it could be said that we have 
— User:Eliteplus, 20:42, 5 August 2020 (UTC)
Stance: keep
Cited policy: WP: THREE (Wikipedia:Reliable sources)