ebooks and how to acess them

I am researching a subject (history). Using Google search engine I come up with several very interesting books on my subject -  but only two or three  pages of each. I I want to know how do I get access to the whole book online? I assume I have to pay something? I see one button 'Add to my Library'. But I cant make sense of this.
I am enclosing a SCREENSHOT of a book I recently located in this way and want to be able to read the whole book without having to buy the physical copy.
Michael MurphyAsked:
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Joe Winograd, Fellow&MVEDeveloperCommented:
> I want to know how do I get access to the whole book online? I assume I have to pay something?
> without having to buy the physical copy

You probably have to click the BUY EBOOK button:

buy ebook
Regards, Joe
That book contains copyrighted material. You cannot have it free as pdf online. You must buy it.
What you can do is only to find a cheaper price as for example Google Play:

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