Best books on non-fiction subjects

[Jdanz]

Like theory of poker is to poker as .........

So all you need to know/ or even just a good overview of a subject.

Other examples, maybe

Intelligent Investor -> Value investing
Valuation, McKinsey & co. -> Valuation

Also interested in canonical works on a subject.

Examples

The Wealth of Nations -> Economics
A Study of History,Toynbee -> History

Also I don't have practical examples but i'm interested in the best how to books:

examples:

best learning spanish book
best computer programing/web design book

Let's just hear what 2+2 thinks are the best informative books and in what category/capacity.