Correct way of Citing References in a writing a Non-Fiction book?

I am trying to write a non-fiction book about summarizing core computer science concepts. I plan to self publish this book through the Amazon Kindle Direct Publishing program. My target audience includes

1. undergrad freshmen
2. business managers working in a tech industry but have little or no technical knowledge
3. general public interested to learn more about computer science

I am curious what is the correct way to cite the sources if I were to adopt the IEEE or APA reference style? I understand how the APA/IEEE style is used (e.g I used them in my school's reports)

Thing is, I don't really see non-fiction book putting the references like this in the main body of their text,

ADHD has a prevalence of around 5% among children (Someone, 2013) and 2.5% among adults (Someoneelse, 2007).

For authors who adopted IEEE style, they also don't usually put the numbering e.g [1] in the main text. So is it okay if I just leave the references at the end of the book?