Do I use MLA style or APA style or no style?

If you do cite, and since your book isn’t literary or scientific, then just put your citations in parentheses (Author, p.) with a works cited page at the end of the book. Even the works cited page probably does not need to be in any specific form. You could also use superscripts and cite the works at the bottom of each page, like in a literature book. A third option would just be to introduce your source before you use their information (According to Doofus,....)

What style is your audience going to be familiar with?

What style do you find aesthetically pleasing? (I myself detest parenthetical references—it’s trivial to do real footnotes. Your opinion may vary.)

Footnotes are only really seen in scientific papers where references in parentheses make following what the hell is going on tricky.

My advice would be to include them in the text (ie Joe Bloggs in his book whatever says blah) if they are important to the point you are making but not include every source you use as you state it is not a literay work you are producing.

If the piece is for a college course use whatever citation system the college tells you.

Er, footnotes are also frequently seen in papers in the humanities.

If you are making use of source material that needs to be credited, you have to cite it, no matter what field you’re in. If you’re not working under a specific set of rules (i.e., for a certain journal or school assignment that specifies style), choose the style that best suits what you have to cite and what type of content it is. (Sometimes even fiction is footnoted!) In some cases chapter or book endnotes are best.

For a short e-book, use endnotes. They’re not nearly as distracting as parenthetical citations. You could also use footnotes, but footnotes on the web are difficult to format, and it doesn’t sound like the information you’re citing is going to need to be read by every reader.

Thanks to all. You guys were very helpful. =D

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For short book, you can do with end-notes.
For largers ones, foot-notes are preferabale.
If there’s no binding on you to use specific style (MLA/APA), take the one you like.
Otherwise, use that is told by the customer (professors, readers, publisher, etc.)

Yeah thanks. I ended up using APA style.