A nice collection of possibly handy tips, perhaps to be viewed with similar scepticism as a wikipedia page, but facts? The title article cites a book published

A nice collection of possibly handy tips, perhaps to be viewed with similar scepticism as a wikipedia page, but facts? The title article cites a book published in 1983 and makes no mention of any assumptions about geographic or cultural variances, never mind changes in attitude since the introduction of some little things like the web, social media, and always-on mobile internet. Much less ideas like customer-focused targeted marketing that didn't exist in 1983. I'm sure there's a lot of truth in there, but really if something says it is "research based", it really ought to be able to cite some actual data, methodology and underlying assumptions.